By George Sly
Goose Pond FWA has gained a well-deserved reputation as a site for spotting rare birds. Now we can add a mammal to the category of rarities. On Dec. 17th, 2015, during the GPFWA Christmas Bird Count, Sandy and Jeff Belth of Bloomington spotted a river otter on the property. CBC compiler Lee Sterrenburg noted that this is not only a first for the property but is likely the first river otter record for Greene County. The IDNR’s distribution map currently shows this species as absent from the county.
The river otter (Lontra canadensis) is a member of the same Family of mammals (Mustelidae) which includes the mink, long-tailed weasel, least weasel, and badger. In other words, we could think of it as a big, aquatic weasel. River otters were once abundant throughout the state of Indiana. From pioneer times, the lure of their luxurious fur attracted trappers. This combined with habitat loss and water pollution worked against the river otter and by 1942 it had been extirpated in the state. Between 1995 and 1999, 303 river otters were released in northern and southern Indiana. The first 25, brought in from Louisiana, were set free at Muscatatuck NWR. The reintroduction has been extremely successful with river otters now occurring in all but 12 counties in Indiana. The species was removed from the state endangered list in 2005. In fact, river otter populations have grown to such an extent that the Natural Resources Commission recently proposed that a limited trapping season be instituted.
Fish are the primary prey of river otters and thus it is no surprise that they favor aquatic habitats such as lakes, rivers, streams, and ponds. Sleek of build, with a flattened head for lessened friction drag, otters are amazing swimmers. The feet are webbed for swimming but, when moving through the water at high speed, the whole body and tail undulate in the typical aquatic mammal pattern. In addition to fish, river otters will eat other aquatic prey such as crayfish, frogs, mussels, and insects.
The reproductive behavior of river otters is interesting in that they, like many other mustelids, exhibit delayed implantation. Mating occurs most often in the spring (March-April) but the fertilized egg does not implant in the uterine wall immediately. Implantation is delayed for several months. As a result, although the actual gestation period averages about six weeks, the young are born the following spring. Average litter size is 2 to 4. Delayed implantation seems to be associated with life in temperate climates and longer life spans. However, the adaptive value of such a diapause seems to be poorly understood. (http://www.ncbi.nlm.nih.gov/pubmed/15058730). Otters den most often along the bank of their aquatic habitat. They may use natural tunnels for their dens but have also been known to eject the original builder, a beaver or muskrat for example.
Otters in general are often described as curious and playful. Personal observations have convinced me that they are. My wife and I escaped to Florida this winter and in the canal behind our house lived river otters. Occasionally they would come by our boat dock for a visit. Coming to the shore, or actually climbing up on the dock, they would linger and peer up at us as inquisitively as we watched them. We would often see them nudging a leaf or potential food item through the water with their nose. Releasing it, they would dive in their wonderfully graceful manner only to return for more play. Many years ago, we visited Peace Corps colleagues in Thailand who had two small-clawed otters living in their house. These are small, Asian relatives of our river otter. The two bundles of energy seemed to spend most of their day at play racing through the house in a game of “catch me if you can”. One of their favorite toys was a wooden box containing a ball. There was a hole in the box through which the otters could reach and thus grasp the ball. However, the hole was too small to allow them to pull the ball out with their paw wrapped around it. As we sat and chatted with our hosts, the otters would race into the living room tumbling over one another. Suddenly, as if seized by a momentary obsession, one of them would run to the box and insert a front paw. With a look of intense concentration, it would manipulate the ball for a few seconds. After what seemed to be a most pleasing bout of tactile stimulation, it would withdraw its paw and shoot off into another room with its partner in full chase. It did indeed look like loads of fun.
River otters do occasionally conflict with the interests of humans. This most often occurs when otters choose a private pond or fish hatchery as their larder. With the increase in river otter numbers in the state has come a rise in the number of damage grievances filed. In 2011 the DNR received 34 such complaints. In 2012 the number rose to 69 and, in 2013, 86 complaints were noted. Fencing has been suggested as one method for preventing such depredations. It should be noted that river otters prey heavily upon slower moving, nongame fish species (Whitaker, 2010). These include suckers, chubs, dace, and darters. However, they do not eschew bluegills and other sunfish. As adults, river otters have few enemies other than humans. However, their young may be vulnerable to predators such as coyotes and bobcats.
Perhaps the recent arrival of the river otter at GPFWA is a harbinger of things to come. Although some might begrudge this fish-eating species as a competitor, it does represent the return of an Indiana native. The presence of the river otter is but one more example of the oft-cited adage – “build it and they will come”. We have certainly seen this to be true in regards to the avian visitors and residents of Goose Pond. Perhaps we will now see the palette of mammalian species inhabiting the GPFWA ecosystem become more brilliant as well.
Whitaker, Jr., John O. 2010. Mammals of Indiana. A Field Guide. Indiana University Press. Bloomington.
*otter photo courtesy of Indiana Public Media
For this edition of Critter Corner, I’d like to shift gears and return again to consideration of Goose Pond mammals. Since the fall hunting season is well upon us, it seems appropriate to ponder the habits of one of the state’s most popular game animals – the eastern cottontail rabbit. This very familiar animal belongs to a family of mammals known as the Leporidae. There are about 27 species within this family in the United States. Six of these are jackrabbit species, a couple of them are hares (snowshoe & Arctic), and the rest are rabbits of various kinds. Most of these are in the genus Sylvilagus (Latin silvi- woods+ Greek lagōs hare), as is our native cottontail. Incidentally, we do have one other species of rabbit here in Indiana. Sylvilagus aquaticus, the swamp rabbit, is a larger cousin of our eastern cottontail. This species occurs only in the forested flood plains of Gibson, Knox, and Posey Counties. It is protected as an endangered animal in Indiana.
Jackrabbits may be considered a type of hare and these leporids differ from rabbits in a few ways. For example, newborn hares are precocial while rabbits are altricial. Precocial young are furred at birth, have opened eyes, and are capable of being highly active within minutes of birth. Picture a neonatal antelope or deer for example. Altricial rabbits on the other hand are born furless, closed-eyed, and helpless. They must remain in the nest (form) for several days before they actively move about. Hares are generally larger than rabbits and have bigger ears and longer hind legs. Jackrabbits are close to two feet in length and can weigh upwards of 10 pounds. An eastern cottontail is by comparison a little over a foot in length and weighs an average of 2.6 pounds. Many years ago, my first jackrabbit burst forth from beneath a creosote bush in SW Texas. Initially, as my mind raced to identify the fleeing missile, I was perplexed and mentally ran through a checklist of fox-sized animals. Jackrabbits really do look huge when one is only accustomed to seeing a rabbit darting out from underfoot.
Eastern cottontails will utilize habitats of many different types. However their preference seems to be for oldfield type environments, particularly those which contain briars and brush. Although they may occur in wooded habitat and even in urban areas, thick ground cover is optimal for them. Cottontails do not burrow but will readily utilize subterranean dens made by other mammals such as woodchucks.
Eastern cottontails eat a wide variety of plant materials. Warm weather foods might include grasses, clover, and plantain. During the winter, eastern cottontails turn from grazing and become browsers. During this time they eat the bark and sprouts of woody plants such as maple, sassafras, and briars. The feeding habits of cottontails are interesting in that they are able to consume large amounts of vegetation quickly and then convert it into a form for later use. This allows them to reduce the amount of time that they forage in the open where they are vulnerable to predators. Later, withdrawing to a more secluded spot they will produce fecal pellets that are nothing more than undigested plant material. These pellets look very much like little miniature versions of the alfalfa pellets one might feed to livestock. The cottontails then eat these fecal pellets and this time more completely digest the organic material in them. A feeding behavior such as this is known as coprophagy.
The reproductive potential of the eastern cottontail is indeed great. Given its many enemies, it is a good thing it can quickly regenerate its numbers. Average litter size is around five young and they can produce as many as half a dozen litters per year although three or four is more common. The gestation period is about one month. The young are born in a slight depression in the ground made by the female which she lines with grass and with fur plucked from her belly. Young rabbits begin to leave the nest and forage on their own by the second week following their birth.
Eastern cottontails really do have a tough go of it. Although it is possible for some rabbits to live over three years, the average life expectancy is slightly less than one year. Decimating factors include parasites, disease, and predators. Of course, nowadays automobiles are an extreme hazard to cottontails. This is especially true where habitat availability is minimal and may consist primarily of roadside vegetation.
Mumford and Whitaker (1982) list some twenty species of parasites found on eastern cottontails. These included a variety of fleas, mites, and ticks. An important disease of rabbits is tularemia given that this bacterial infection may be transmitted to humans. My grandfather was always insistent that I thoroughly wash my hands with soap, and then give them a good dousing with rubbing alcohol, after cleaning the rabbits we harvested. Look out for “rabbit fever” he warned. Mumford and Whitaker studied 68 case histories of tularemia and found that 88% of them involved contact with rabbits. The disease may also be transmitted by ticks. If this disease is unfamiliar to you, there is an interesting discussion on Wikipedia.
The predators of eastern cottontails are many. These include the red fox, gray fox, and coyote. Domestic cats will also take them. Serpents such as black rat snakes may eat young cottontails. Avian predators know to attack cottontails include barn owls, long-eared owls, great horned owls, rough-legged hawks, northern harriers, red-tailed hawks, and crows.
Of course humans take a great number of eastern cottontails during the hunting season. At Goose Pond FWA however eastern cottontails seem to be an under utilized late-season game resource. GPFWA Property Manager Travis Stoelting reported that only 38 rabbits were taken by hunters last year. This may be a reflection of the fact that the state has seen a general decrease over the years in the number of hunters pursuing rabbits. A 2011 article by Paul Moore, in Game & Fish Magazine, reported that around 200,000 rabbits are taken annually in Indiana compared to former numbers which were closer to one million. Looking further back, the latter number pales in comparison with the 2,243,000 cited by Mumford (1969) as the average number taken annually during the 1950’s. The number of rabbit hunters has also declined over the last few years from around 200,000 to 70,000. Moore believes that a shift toward more hunters pursuing deer and wild turkey have contributed to this decline. Additionally, he believed loss of habitat had resulted in decreased rabbit numbers. This is also a deterrent to hunters who might otherwise pursue rabbits.
For those of us who have hunted the eastern cottontail with avid interest, it is no wonder that this species was at one time the most popular game animal in Indiana. These days I find myself much more prone to photographing or simply watching a game animal. Such, I suppose, is the waning of the desire to take that comes with age. But I still recall with great fondness the hours I spent afield, as a young man, in pursuit of rabbits. The camaraderie of hunting companions, the genuine enjoyment of watching a good pair of beagles happily at work, and the thrill of the chase all bring pleasant memories. Of course the remembrance of a plateful of fried rabbit backed up by a healthy portion of biscuits and gravy is not to be lightly dismissed either. There is no wild game of finer taste in my humble opinion.
In considering the many interesting aspects of the natural history of the eastern cottontail, as well as its historical importance as a small game mammal, we are forced to accept the presence of this little mammal at Goose Pond FWA as yet one more reason to celebrate the property’s wonderful biodiversity.
Mumford, Russell E. 1969. Distribution of the Mammals of Indiana. Ind. Acad. of Sci. Monograph No. 1
Mumford, Russell E. and John O. Whitaker, Jr. 1982, Mammals of Indiana. Indiana University Press. Bloomington, Indiana.
By George Sly
With the beginning of fall, and the anticipation of the frosty weather to come, this edition of Critter Corner is devoted to a common denizen of the Goose Pond wetlands who will soon enter its long winter nap. Normally by late October we will have seen the last of the Common Water Snake until its emergence from hibernation in late March or April. In Indiana, Nerodia sipedon is by far the most common water-dwelling snake. Practically any body of water may serve as habitat for this species but they seem to prefer aquatic habitats that are shallow, relatively warm, and with little or no current.
Common water snakes are frequently seen basking on logs, stumps, overhanging branches, or sometimes even on the banks of ponds and marshes. They seem to have some degree of curiosity as I have had them approach me while fishing from a shoreline. One of my childhood memories of first encountering this species was glancing down to check my stringer of bluegills and seeing a Nerodia lying there peering up at me. As an adult with a great fondness for snakes, I’m mortified to report that this first chance meeting saw me take to my heels in terrified flight. Left behind was the stringer of fish and my tackle. Of course, at my first movement, the water snake hightailed it in the opposite direction and was nowhere to be seen when I rather embarrassedly crept back to retrieve my possessions.
This brief story does illustrate the fact that a good many people, even as adults, possess a rather unreasonable fear of the common water snake. As a retired biologist, I can’t recall the number of times people would report seeing one of these snakes while fishing or otherwise being around the water. Invariably they would refer to this animal not as a common water snake but as a “water moccasin”. Despite my assurances that what they had seen was not an example of that highly venomous species, I had the feeling that my explanations were often falling on deaf ears. There are two points to be made here. First, this confusion is a really good example of why biologists generally prefer scientific names over common names. As most of you probably know, each species of organism has its own scientific name. Such names are generally derived from Latin or Greek. They are comprised of the Genus name (in this case Nerodia, referring to the snake’s habits) and the specific name (here it is sipedon, which refers to its bite). A common name on the other hand may refer to different organisms. These two snakes are an example. Sometimes a common name is used for totally different animals. The term gopher may bring to mind a turtle in Florida, a true pocket gopher in Illinois, or a ground squirrel in Indiana. Sometimes common names can mislead; a starfish or a jellyfish is not really a fish. So, to make a long story short, folks living within the range of Nerodia sipedon often simply use the common moniker of “water moccasin” for this species.
A second reason that the common water snake is often mistaken for a true water moccasin, or cottonmouth, is that they do indeed look quite a lot alike. Incidentally, the western cottonmouth (Agkistrodon piscivorus) does actually occur in Indiana. In 1983 a relict population of this snake was found in Dubois County. The cottonmouth is listed as an Endangered Species in Indiana. There are, of course, significant differences in the anatomy of common water snakes and the cottonmouth. The differences are such that they are placed into different families (Colubridae and Viperidae). Think of it as being like separating carnivores into the cat family and the dog family. Nevertheless, many of the water snake species bear a strong resemblance to the cottonmouth in terms of coloration, stocky build, and habitat preference.
Another story might illustrate how much alike they really can look at times. My wife and I had the opportunity a few years ago to canoe the Wekiva River in central Florida. She sat in the bow; I was at the stern. It was a beautiful stream which quietly flowed through forests of cypress and gum and we leisurely paddled our way along attentive to any animals we might spot. As we rounded a bend, I saw a fallen tree whose barren branches hung out over the stream. In the top of this tree, some ten feet above the water, basked a good sized snake. The large heavy build, broad head, and distinct dark crossbands on a brownish body fairly shouted cottonmouth to me. Urging Anne to help me paddle closer, I continued looking upward at the somnolent snake. Now, the closer I got, the less sure I became of my identification. I asked Anne to help me move a little nearer. Now, in close proximity to the snake, I became convinced that it was after all simply a Nerodia species of some sort. If only I could get a little nearer I could be certain. Suddenly I became aware that in spite of my strong paddling I was making no headway in getting closer to my quarry. It was then that I looked to the bow of the canoe to see Anne furiously beating the water to froth. I had inadvertently put her into a position whereby the snake in question loomed ominously right over her head. The turbulent flow issuing from her paddle would have done the old stern-wheeler Mississippi Queen proud. Needless to say I got no nearer the serpent but by now it had indeed resolved itself into a brown water snake. No big deal.
As one would expect of such a highly aquatic snake, their diet consists of fish of assorted kinds including various minnows and catfish. Common water snakes have little impact on game fish populations. They will also eat frogs and toads, their tadpoles, and salamanders. Water snakes are ovoviviparous which essentially means that females retain their eggs internally until the yolk-fed young are born alive. The number of offspring in a litter may be several dozen but the average seems to be around eight. Water snakes of all kinds do of course have their own predators. Large fish, such as bass, as well as wetland birds such as herons will take them. Marshland mammals including raccoons and mink will also prey on snakes. Juvenile water snakes may even fall victim to bullfrogs.
It is best to enjoy a chance meeting with the common water snake from a distance. Although non-venomous and essentially harmless, they do have a nasty disposition. Given a chance they will flee but cornering or trying to handle them seems to bring out their dark side. In such cases, they will bite fiercely and often.
Common water snakes, by acting alternatively as predator and prey, serve as an important cog in the complex ecological machinery of the wetland. Oh, and one more thing. Let’s not call them water moccasins.
For those with further interest in Indiana snakes, I recommend:
Conant, Roger and Joseph T. Collins. 1998. Reptiles and Amphibians: Eastern/Central North America. Peterson Field Guides. Houghton Mifflin Co. New York.
MacGowan, Brian and Bruce Kingsbury. Snakes of Indiana. IUPUI Fort Wayne and IDNR, Division of Fish and Game. Indianapolis.
Minton, Sherman A. 2001. Amphibians & Reptiles of Indiana. Indiana Academy of Sciences. Indianapolis.
By George Sly
As all of us know, a visit to Goose Pond FWA can present us with an extraordinary visual banquet. The sight of thousands of Sandhill Cranes descending into their evening roost, the stately soaring of a group of American White Pelicans, or the blizzard of Snow Geese departing on a feeding foray are the kinds of visual images which tend to remain imprinted in the minds of we who love wild things. But the Goose Pond can offer another kind of feast as well; this one is an auditory treat. For many, the melodic trill of the Red-winged Blackbird is all that is needed to conjure images of a wetland in the mind’s eye. Others would say much the same in regards to the unk-a-chunk pump handle call of the American Bittern or the whinnying call of the Sora. Here I would like to nominate one additional candidate as a distinctive voice of the Goose Pond wetlands – the Bullfrog (Rana catesbeiana).
The deep, bass “brr-rum” of this frog is unmistakable among the frog fauna of GPFWA. If one wants to be immersed in the natural loveliness that is GPFWA I suggest this exercise. Find yourself a secluded spot overlooking the wetlands. The parking spot near the old bridge on the south end of CR 1200 W is one of my favorites. Situate yourself there along about sunset and prepare to be enthralled. While one gazes out over the main pools, their emergent vegetation glowing golden in the light of the setting sun, there will come from a dozen directions the sonorous “brr-rumming” of the bullfrogs. Their little cousins, the Cricket Frogs, will add a chorus sounding much like the striking together of two large rocks. The last, evening trills of the redwings and a final verbal squabble among the geese will add to the atmosphere. Sitting, listening, contemplating one can be carried back to a time when Indiana was truly wild. It is not a bad way to spend an evening.
The volume and tone of their call immediately suggests size and the Bullfrog is indeed our largest Indiana frog. In fact the Bullfrog is the largest frog in North America and one of the largest in the world. The average body length of the Bullfrog is about five inches (record eight inches according to Minton2001). Their enormous legs can add another eight to ten inches to the total length. Average weight is around a pound.
I once saw a Bullfrog leap from the water in an attempt to snag a meal of Red-winged Blackbird. I also seem to remember running across a newspaper article years ago which had a photo of a Bullfrog which had a rattlesnake in its mouth. Such dietary endeavors obviously suggest an anuran of extraordinary size and strength. Bullfrogs will apparently eat about anything they can stuff into their mouths. Minton lists among their prey animals such as crayfish, insects, insect larvae, other frogs, minnows, tadpoles, and small mammals. They really are quite voracious. This gastronomic quality has a downside. Bullfrogs are native primarily to the Midwestern and eastern United States. However they have been introduced into many western states and even some foreign countries (such as Canada and Taiwan). These introduced frogs, as is typical of invasive species, invariably cause ecological damage among native faunas.
Incidentally, we have another frog which is somewhat easy to confuse with the Bullfrog. The Green Frog is also large and has a coloration and general body form quite similar to those of the Bullfrog. A distinguishing feature is that the Green Frog has a ridge of skin (called the dorsolateral fold) which runs along the outer edges of its back. The bullfrog’s skin in this area is smooth, not raised into a fold. The call of the Green Frog has often been likened to the twanging sound of a plucked banjo string. It has neither the bass nor volume of the Bullfrog’s call.
Like most other frogs, Bullfrogs reproduce in the water. They practice external (though direct) fertilization of the eggs therefore the water is necessary as a medium for the sperm to swim into contact with the eggs. Eggs are laid in tremendous numbers and hatch within a few days. May through July seems to be the primary period for egg laying. Bullfrog tadpoles typically take one to two years to metamorphose depending on latitude and thus water temperature. Like other anurans (frogs and toads), Bullfrogs hibernate during the winter by burying themselves in the bottom mud, or under submergent debris, in their aquatic habitats – marshes, ponds, streams, strip-pits.
Bullfrogs are prized by many for the edible quality of their legs. To hunt Bullfrogs in Indiana, once must have a hunting license and the season is regulated. Hunting Bullfrogs (and Green Frogs) is permitted from June until April of the following year. This season the specific dates are June 15, 2014 – April 30, 2015. There are certain restrictions on how these species may be taken. Hunters may use a gig or spear with a head not more than three inches in width and a single row of tines. It is also permissible to use a long bow and arrow. A person may use their hands, a club, or a fishing pole (or hand line). Not more than one hook or artificial lure may be attached to the line. The only type of gun allowed for frog hunting is a .22-caliber firearm and it must be loaded with bird shot.
Minton, Sherman A. Jr. 2001. Amphibians and Reptiles of Indiana. Indiana Academy of Sciences. Indianapolis.
By George Sly
On a recent drive through Goose Pond FWA, I saw a sad but all too common sight along the highway. Lying at the side of the road was the lifeless body of one of GPFWA’s most interesting mammals – a striped skunk. After spending the harsh winter in a prolonged state of inactivity, these strikingly marked animals seem to succumb to an insatiable wanderlust. Driven by the dual urges of hunger and reproductive instinct, striped skunks begin to prowl the countryside in search of food and mates. Conservationist Aldo Leopold, in his wonderfully poetic way, described the track of one such individual through a late winter snow. “. . . it leads straight across-country, as if its maker had hitched his wagon to a star and dropped the reins.” Unfortunately such wanderings all too often result in the skunk making an incautious foray onto a roadway. It seems to me that the roads of late January and February are especially unkind.
The striped skunk was, for many years, placed by taxonomists into the same family as the weasels. With the rise of molecular biology (DNA analysis particularly) this taxonomy has been revised. Skunks are now placed into their own family which is called the Mephitidae. In the eastern United States there are two species within this family, the striped skunk and the spotted skunk. The latter is now considered extinct in Indiana. It is thought that Indiana was positioned at the northern edge of the spotted skunk’s geographic range. Written references to spotted skunks in Indiana are based upon specimens from more southerly counties such as Knox and Posey. So far as I am aware, the only actual physical evidence of spotted skunk in Indiana is a mandible found in a cave in Lawrence County in the late 1950’s.
Our striped skunk bears the scientific moniker of Mephitis mephitis. This name is derived from the Latin word for a noxious vapor. The ability of this species to spray such a “vapor” is likely the aspect of the striped skunk’s biology most familiar to people. I’m sure many of us have had the unpleasant task of trying to rid our dog of the odor bestowed upon it as the result of an impetuous assault on a striped skunk. The spray of the skunk is comprised of a chemical with an official name as long as one’s arm but it is basically a sulfur-containing compound called butyl mercaptan. This chemical is forcefully released from a pair of glands located just inside the skunk’s anal opening. The spray is a defensive weapon of course and its effect goes well beyond being unpleasant to smell. I was once afield with one of my dogs when it ran afoul of a striped skunk. Perceiving the dog, the skunk arched its back, raised its bristles and tail, and quickly turned its posterior to the dog. All of these were signs that it meant business. The dog in question was about to have its first encounter with an exceedingly irritated striped skunk. Growling and rushing toward the skunk, the dog received a full blast of the spray in its face. The reaction was immediate and intense. Yelping and leaping away from the skunk, the poor victim began salivating powerfully. The pitiful hound shook its head violently as if attempting to throw off the substance so painfully attacking its eyes. He rubbed his face upon the ground as the powerful burning in the eyes intensified. The nauseated dog retched, foamed at the mouth, and otherwise demonstrated the total debilitation the skunk had inflicted upon it. Henceforth I had a much greater appreciation of just how effective the defensive spray of a striped skunk could be.
Under normal circumstances, and given room to maneuver, the striped skunk is perfectly content to mind its own business. Most of the individuals I’ve run across were busily moving along with their peculiar waddling gait, nose pressed to the ground in their apparently perpetual search for food. Striped skunks are omnivorous although they do have a tendency to feed heavily upon insects. These often take the form of beetles and their larvae, the so-called grubworms. Skunks will also eat other mammals including mice and shrews. Bird eggs and fruits, such as persimmons, are common in the diet of striped skunks too.
Striped skunks utilize a variety of habitats including woods, oldfields, vegetated fencerows, riparian vegetation, and brushy fields. They are sometimes seen abroad during daylight hours, especially toward evening, but are mostly nocturnal in their activities. Striped skunks utilize burrows as dens. These may be dug by the skunk itself or may have been constructed by woodchucks or other larger burrow-diggers. Striped skunks have one litter of young per year (February or March) and generally produce four to six offspring at a time.
Striped skunks, like most wild mammals, harbor a variety of parasites including fleas, lice, mites, and ticks. Internal parasites which have been found in skunks include flukes, tapeworms, and nematode worms. They are also vulnerable to distemper and rabies. As noted, being killed upon a road is a major danger to striped skunks. One their major natural predators is said to be the great horned owl.
The striped skunk represents just one more mammals that you might encounter on a visit to the Goose Pond FWA. Although often castigated by humans, the striped skunk is but another example of an exceedingly interesting mammalian species busily attending to its role in the grand web of wetland life.
By George Sly
In previous editions of Critter Corner I have dealt with Goose Pond FWA’s larger and more economically important mammals. Most of these (muskrat, mink, and beaver) are typical wetland mammals. However, we should recall that GPFWA contains habitats other than wetlands. Much of the property supports restored prairie and old-field habitats. The latter we may define as abandoned pasture or cropland which has grown into an assemblage of grasses, forbs (broad-leaved flowering plants), and/or shrubby vegetation. Common grasses could include brome grass, foxtail, bluestem, fescue, and panic grass. Characteristic forbs in old-fields are goldenrod, ironweed, Queen Anne’s lace, and daisy fleabane. Representative old-field shrubs or woody plants might include blackberry, raspberry, sumac, red cedar, and maples. Within these grasslands and old-fields live arguably the GPFWA’s most abundant mammals – the “field mice”.
I say “field mice” parenthetically because this is the term generally applied to any mouse-sized rodent a lay person sees scamper from underfoot. In reality, there are at least ten distinct species of small mammals in Indiana that would fit that description. Of these, one of my personal favorites is the meadow jumping mouse. My specimen catalog tells me that I first encountered this species in July of 1969. Previous to that, I was unaware that such an interesting little animal even existed. Looking at that first specimen of Zapus hudsonius, I was struck by its handsome coloration. The sides were yellowish with scattered dark hairs. The mid-dorsum was a darker yellowish-brown, the belly white. The total length of the specimen was around eight inches, but over half this length was comprised of its surprisingly long tail. Typically a mouse this size has a hind foot length of about 0.7 inches. The hind feet of the jumping mouse measured well over an inch and were much larger than the front feet. Given this description, perhaps you can form a visual picture and understand my initial fascination with this mouse. Looking at it was akin to peering at a miniature kangaroo. Walking through a field of grasses or forbs, it would not be surprising for you to catch a glimpse of this little mouse as it bounds away in a series of kangaroo-like leaps of two feet or so. After hopping away in this manner, the meadow jumping mouse typically darts into thicker cover or sits quietly relying on its camouflage for further protection.
Technically speaking, the meadow jumping mouse is not seen on the list of mammals found at GPFWA during the 2010 biodiversity survey of the property. During the survey’s collecting period none were taken. However I have seen an individual leaping away, in the manner described above, in the southern part of the property. This individual was in the typical heavy herbaceous cover preferred by meadow jumping mice. Whitaker (1982, 1998, 2010) and Mumford (1969) both report that the meadow jumping mouse is often partial to dense stands of touch-me-not (Impatiens) and that it utilizes the seeds of this plant as an important food source as well. Other major foods in the diet of meadow jumping mice include the subterranean spores of the fungus Endogone, foxtail and other grass seeds, and lepidopterous (moth/butterfly) larvae.
Lest, after reading this, you head for the GPFWA to try to flush a meadow jumping mouse, be aware of one other most interesting trait of this species. It is a deep hibernator. Records show that the third week in November is the latest that this animal appears to be active. It then retreats to an underground nest constructed of plant materials. Here, at near freezing temperatures, it reduces its heart rate, respiration rate, and body temperature as it sleeps away the remainder of the winter. Assuming that they have enough fat reserves to survive hibernation, meadow jumping mice then reappear above ground in late April or early May.
While humans often completely overlook animals such as the meadow jumping mouse as a component of an ecosystem, such species are important in the natural scheme of things. Jumping mice are preyed upon, and thus help sustain, other species such as barn owls and red-tailed hawks. Serpents such as prairie kingsnakes and black rat snakes may feed upon them. Other mammals too, including foxes and coyotes, will eat jumping mice. The mice themselves help maintain an ecosystem’s ecological balance by preying upon insects and feeding upon plant seeds. All in all seldom recognized and little appreciated small mammals, like the meadow jumping mouse, represent still one more engaging component of the GPFWA fauna.
Jackson, Hartley H.T. 1961. Mammals of Wisconsin. The Univ. of Wisconsin Press. Madison.
Mumford, Russell E. 1969. Distribution of the Mammals of Indiana. Indiana Acad. Sci. Monograph No. 1
Whitaker, J.O. Jr. and Russell E. Mumford. Mammals of Indiana. Indiana Univ. Press. Bloomington
__________and William J. Hamilton. 1998. Mammals of the Eastern United States. Cornell Univ. Press. Ithaca, NY.
Whitaker, J.O. Jr. 2010. Mammals of Indiana- a Field Guide. Indiana Univ. Press. Bloomington
By George Sly
Like the previously discussed muskrat and mink, the American beaver is another mammal most everyone associates with wetlands. Chances are, if you spend much time afield, you have seen evidence of the presence of beavers in the form of gnawed trees, dams, or lodges. Perhaps you have been lucky enough to see the architects of these signposts themselves. It has not always been so easy to do so. The beaver was essentially gone from Indiana by the mid-nineteenth century. Reintroduction of the species into the state began around 1935. Beavers were relatively uncommon in Indiana even into the 1970’s. I can still recall, while in graduate school in 1971, being shown a beaver dam near West Terre Haute. It was the first time that I had ever seen one. The dam struck me both as a marvel of the beaver’s industry and as a symbol of hope in the restoration of some of Indiana’s lost biota.
The beaver’s demise throughout much of its historical range was, of course, due to the luxurious fur which covers its body. Beaver fur was primarily in demand for making beaver felt hats in Europe. Beaver pelts destined for this purpose were shipped from the United States beginning in the early 1600’s. The pursuit of beavers by fur trappers is, according to numerous sources, one of the primary factors in the initial exploration of both Canada and what was to become the western Untied States. By the mid-1800’s, fashion had evolved and hats of silk rather than beaver felt became the style. With this fickle shift in human preferences, the trapping pressure directed toward the beaver suddenly declined. Even today however some fur-trapping of beavers is done. Nineteen of them were taken at GPFWA last year during the trapping season which ran from mid-November to mid-March. Beaver pelts have, most recently, been worth around fifteen dollars to the trapper.
Folks often ask why beavers so diligently work to build and maintain their dams. They do so for several reasons. By constructing dams across running waterways, beavers create a pond of some depth. These large rodents (second only to the South American capybara in size) utilize underwater entrances to their burrows and lodges. By creating a pond, beavers are thus able to enter their dens hidden from potential predators. Having deep water in which to plunge also allows surface swimming beavers to avoid danger by diving. Such an escape dive is often preceded by a wallop to the water’s surface with their broad, flat tail. The sound is much like the shot of a .22 caliber rifle and alerts other beavers to the presence of danger. Impounded water also provides the beavers with a means of floating pieces of vegetation to a lodge or dam. In the winter, the deep beaver pond may freeze near the surface but the unfrozen depths still allow the animals to move in and out of their lodges to forage for food.
In regards to food, beavers are vegetarians. Their diet consists primarily of the bark and/or twigs of trees such as cottonwood and willow. These trees are favored because they conveniently grow close to water (such plants are hydrophytic in ecological terms) and have soft wood which makes for easier gnawing. Like other rodents, beavers have one pair of enlarged incisors in the upper and lower jaws. The incisors of beavers are massive and allow them to fell a six inch cottonwood in a matter of minutes. Felled trees are then cut into sections and transported. Some may be used for lodge construction; others may go into building or repairing a dam. Many branches, and small logs, are stored on the bottom of the beaver’s pond near the lodge. The green wood is heavy, becomes waterlogged, and thus lies on the bottom. Here it is available for the beaver, during the winter especially, to simply swim out of the lodge and select a branch from its larder. This wood is usually taken back onto the dry, raised platform within the lodge where the bark is eaten. The bare branch is then taken back outside and discarded. Such bark-stripped branches littering the shore are another common sign of beaver activity in a given area. In the spring and summer other aquatic plants may be eaten. These include cattails, water lilies, sedges, and grasses. Beaver will also feed on standing corn. Just last month, in Sullivan County, I happened upon a well-defined beaver trail leading from a stream directly into a ripening corn field.
Although I have made several references to the beaver’s lodge, they do not always construct such structures. In our area, with the numerous lakes formed by strip-mining for coal, the water depth is sufficiently great as to negate the need for lodge construction. In such habitats, beavers typically burrow into the banks of the lake. However, even such bankside dens are often marked by a heavy accumulation of logs, limbs, and twigs which have had their bark eaten away. As a result the location of the den entrance, even though it is below the waterline, is quite obviously marked.
Beavers, like many other animals, tend to bear their young (called “kits”) in late spring or early summer. Litter size averages three or four offspring. Young beavers stay with their parents for a couple of years and then are driven away by the adults. Thus, a typical beaver colony consists of around six animals; these being the two adult parents and the young of the past year or two.
The behavioral repertoire of beavers is quite fascinating to those of us who enjoy natural history. However, their increasing abundance in Indiana and elsewhere has caused incidences of human-beaver conflict to escalate too. Usually the disturbances caused by beaver activity take one of two forms: cutting of trees or flooding. As mentioned, beavers usually feed on cottonwoods and willows. However, they may enter the yards of people living near lakes and fell a favorite maple or oak tree just as readily. Because of their dam-building instinct, beavers may flood croplands, lawns, or even roads. These activities may present a serious risk to both the economic and personal wellbeing of humans. Burrowing into pond dams and levees, thereby weakening them, is another common problem caused by the activities of resident beavers.
According to Department of Natural Resources statutes, landowners (or tenants) can destroy or capture nuisance beavers without a permit if the animal is discovered damaging one’s property. If this is done, your action must be reported to a conservation officer with 72 hours. Captured animals may be released elsewhere but there are restrictions. First, the animal must be released in the county of capture. Also, one must have permission from the landowner before a captured nuisance animal is released onto their property. This constraint refers not only to private property but includes land belonging to city, county, or state entities.
In spite of their potential to cause annoyances, beavers are exceedingly interesting creatures. Let us all be thankful for properties such as Goose Pond FWA. Here we are able to observe and ponder, without vexation, the fascinating behaviors of one of the most characteristic of wetland mammals.
By: George Sly
In the first two installments of Critter Corner we looked at mammals quite typical of the wetland habitat which comprises much of the Goose Pond Fish and Wildlife Area. These were the muskrat and its arch nemesis the mink. This time let’s look at a mammal which, at first consideration, would seem far removed from the wetland setting.
The white-tailed deer is a member of the mammalian Order Artiodactyla, the so-called even-toed ungulates. This group of animals is characterized by having two functional toes on each foot. Usually a pair of vestigial digits, often referred to as dewclaws, are present as well. Certain bones of the feet are elongated which results in the ankles being well above ground. This adds to the overall long-legged appearance of these mammals. Such limb structure is well-suited for rapid locomotion, flight being the main method of defense in most ungulates. Subgroups (families) within the Artiodactyla include deer, cattle, antelopes, pigs, camels, giraffes, and hippopotamuses.
Deer, such as the white-tailed, are placed in the Family Cervidae. In the United States other cervids include the mule deer, elk, caribou, and moose. One hallmark of the deer family is their possession of antlers. Antlers are bony outgrowths of the frontal bones of the skull and differ from horns, as found in cattle and antelopes, in a couple of ways. Perhaps the most prominent difference is that antlers are replaced each year. They begin growing in the spring and then fall off, or are accidentally knocked off, after the mating season when a decalcification weakens the antlers at their bases. In most members of the deer family, antlers are normally produced only by males. Horns on the other hand are permanent, have a bony core, an external keratinized sheath, and are found in both sexes.
The white-tailed deer, Indiana’s largest wild mammal, is so common now that no description is needed. This species is highly adaptable and therefore occupies a variety of habitats in Indiana including forests, forest edges, reclaimed strip-mined land, agricultural lands, and wetlands. At GPFWA, white-tailed deer are often seen and not just along the outer perimeter of the property. Their tracks and trails are common on the elevated levees of the property and GPFWA staff report seeing them out in the waters of the wetlands. They readily cross the shallow waters (deer are excellent swimmers too) and often feed on aquatic plants in the standing water. The diet of the white-tailed deer is quite varied. In the summer, many types of plants are grazed upon. These include several types of cultivated crops. In the winter, when leafy vegetation is lacking, deer browse woody plants such as sumac, maple, dogwood, and sassafras. This species is now so abundant that people are often surprised to learn that the white-tailed deer was once extirpated from Indiana. J.O. Whitaker, Jr. in his Mammals of Indiana: A Field Guide states that the species was gone from the state by 1893. Although conversion of the landscape to agriculture may have been a factor in the white-tailed deer’s decline, a much more serious problem was severe, unregulated over-hunting. In fact the history of this animal should serve as a reminder as to why we need strong regulations regarding hunting seasons and bag limits for the wild game we pursue. Purdue University biologist Russell Mumford published a monograph in 1969 entitled Distribution of the Mammals of Indiana. The section of the publication referring to the white-tailed deer contains several anecdotal reports which make it quite clear why this animal was becoming rare in Indiana by 1850 and was gone by the turn of the century. Mumford cites a 1909 publication by W.L. Hahn in which Hahn reported that one man was credited with killing (by himself) 370 deer in the fall of 1822. Other similar citations include the killing of 70 deer in a single day “on an island in the Wabash River.” Mumford also mentioned an 1883 report by W.W. Goodspeed which referred to an episode in Warren County in which “hunters encircled 300 deer and killed about 160 of them.” With this type of unfettered hunting pressure, it was only a matter of time before the white-tailed deer joined mammals such as the mountain lion, wolf, bison, elk, and black bear on the list of species eliminated from Indiana by humans.
The white-tailed deer present in Indiana today are the descendants of animals reintroduced into the state, beginning in 1934, by the Indiana Department of Fish and Game, forerunner of today’s Department of Natural Resources. According to the DNR’s informational website these deer were introduced, mostly into southern Indiana, from Wisconsin, Michigan, Pennsylvania, and North Carolina. Further immigration from Michigan helped build the northern populations of the state. Whitaker reports that subsequent population estimates for the species, following reintroduction, were: 900 in 1943, 1200 in 1944, and 2900 in 1946. By 1951 the population had climbed to 5000. Still, even during the 1960’s when I was a teenager, scaring up a white-tailed deer while afield was a noteworthy event. I couldn’t wait to get home and tell everyone of my sighting. This is certainly a far cry from today when an evening’s drive can reveal more white-tailed deer than once existed in the entire state. By 1991 the white-tailed population had reached an estimated 350 000 (McCreedy, 1996).
The white-tailed deer is THE big game mammal of the eastern United States and Indiana is no exception in regards to the popularity of deer hunting. The first regulated hunting season for deer occurred in 1951. Mumford states that 1,590 animals were taken in that first hunt. Today the annual statewide harvest of white-tailed deer is over 100 000 animals, including both sexes. Hunters harvested seven deer from the Goose Pond FWA last year.
The positive economic impact of deer hunting in Indiana is substantial. McCreedy’s 1996 paper on deer management put the figure at over $100 000 000. Of course this is offset by the cost of deer-vehicle collisions and crop damage which, again at the time of McCreedy’s writing, amounted to annual losses of some $40 000 000. We must also take into account the ecological damage which excessively high white-tailed deer populations may cause. When deer become over-populated they can do serious damage to young woody plants. Such plants represent the future forest as well as forage and habitat for other forest-dwelling species. Too many deer can also do extensive harm to herbaceous flowering plant populations. This is not only detrimental to other woodland species from an ecological perspective but lessens the aesthetic impact for human forest visitors. The overgrazing problem has been particularly acute in some of Indiana’s state parks. This has led, in recent years, to the necessity of limited hunting, for herd reduction purposes, in these parks.
In my estimation there is perhaps no other mammal in Indiana that can match the white-tailed deer in regards to its beauty, gracefulness, and agility. However, in the absence of bear or wolf or lion, it falls to us humans to protect the white-tailed deer from its own too much. Managing of the white-tailed deer in the Indiana of the 21st Century requires a complex balancing act. How do we maintain an ecologically sustainable deer population in the state? How do we lessen conflicts between humans and deer? The number of people who hunt seems to be in decline. What is the implication of this shift in human priorities in regards to managing deer numbers? Having brought this native animal back from state-wide extinction, we now find ourselves engaged in an exceedingly challenging exercise in wildlife management.
Is it worth the effort? In spite of a couple of deer-vehicle collisions, I’d have to say yes. I still get immense enjoyment from observing this living icon of an older, primordial Indiana. Ask one of the quarter-million Hoosiers who purchase a deer hunting license and I’m sure they would say yes. Query any of those who understand the spiritual value of wild things and wild places and I believe they would say, absolutely. Yes, I imagine quite a few folks would say that efforts to maintain and manage a restored white-tailed deer population in Indiana are of great worth.
McCreedy, C.D. 1996. Sustainable management of a public resource: The white-tailed deer in Indiana. FNR-153, Dept. Forestry and Natural Resources, Purdue University, West Lafayette, IN
Mumford, Russell E. 1969. Distribution of the Mammals of Indiana. Monograph No. 1. Indiana Academy of Sciences. Indianapolis, IN
Whitaker, John O. 2010. Mammals of Indiana: A Field Guide. Indiana University Press. Bloomington, IN
By George Sly
You may recall that, in our first edition of Critter Corner, we dealt with one of the Goose Pond wetland’s most characteristic mammals – the muskrat. It seems appropriate then to follow up with a mammal whose life is closely linked with that of the muskrat. The mink is a member of the weasel family Mustelidae. An adult male weighs about two pounds and is about two feet in total length. Other mustelids in Indiana include the river otter, long-tailed weasel, least weasel, and badger. The striped skunk was once placed in the weasel family but biologists have now shifted the skunks into their own taxonomic family. In recent years, taxonomists have also debated whether or not the American weasels should be placed into their own genus (Neovison). In many books, Whitaker’s Mammals of Indiana: A Field Guide for example, they are still placed in the genus Mustela. This genus name come from the Latin word for weasel.
Like the muskrat, the mink is highly dependent upon the presence of water. This makes the marsh and riparian (streamside) habitats of Goose Pond FWA ideal haunts for mink. Mink are able swimmers and can dive to several feet below the surface. Although they are primarily nocturnal, mink do occasionally move about and hunt during the day. Thus, it is not totally unexpected to see one nosing along the edge of the water or crossing one of the roads that pass through the property. Not only do mink prey upon muskrats, they will also use the lodges and burrows constructed by these rodents as dens. The closeness of the mink-muskrat relationship is revealed by the fact that a normally muskrat specific mite species was found on 42% of the mink specimens examined by Indiana State University mammalogist John O. Whitaker.
Mink are carnivorous but opportunistic so the animals upon which they prey are varied. D.M. Brooks, who studied mink at Jasper-Pulaski FWA many years ago, reported that their method of eating muskrats was distinctive. He reported that the muskrat’s upper body was opened whereupon the mink ate the muskrat’s heart, lungs, and liver. The mink then fed on the muscles and bones of the forelegs and then the hindquarters. The head, feet, tail, and skin are left uneaten. Aside from the muskrat, mink have also been recorded as eating other mammals including rabbits, voles, shrews, and moles. Other prey known to be taken, at least occasionally, are birds (such as coots), catfish, snakes, frogs, snails, and crayfish. Mink were, in times past, often culprits in attacks on poultry. Of course, with the demise of the family farm, this problem is insignificant now.
Mink are thought to mate mostly in the month of March. Like other mustelids, females exhibit delayed implantation. After fertilization, embryonic growth begins but then enters a period of diapause (dormancy) during which development stops for a time. Once implantation occurs differentiation of the embryo continues and most young are born in April or May. Litter size is usually three to six. Mink babies are altricial and three or four weeks pass before they are active and eat solid food. The young remain in the nest for as long as two months before they began to follow their mother and learn to hunt.
Like other wild animals, mink have their adversaries. Whitaker (1982) has found a variety of internal parasites in the specimens he examined. These included internal parasites in the form of flukes, roundworms, and tapeworms. External parasites were common and included fleas, lice, mites, and ticks. Mink seem to have few predators but wild canids such as foxes and coyotes may attack them. Great horned owls, also a predator of striped skunks, likewise attack mink. The mink is a species that has long attracted the attention of fur trappers. Some trapping of mink is still done at Goose Pond FWA. Property Manager Brad Feaster reported that 52 animals were taken last year. Fur prices for mink are about $22.00; this represents revenue of over eleven hundred dollars for the trappers involved. Of course the greatest long term danger to mink is the draining of wetlands.
So, on your next trip to Goose Pond FWA, be alert. While cruising one of the area’s back roads or quietly watching a stalking great-blue heron you just might, if luck be with you, spot one of the property’s most elusive residents.
Brooks, David M. 1959. Fur Animals of Indiana.
Pittman-Robertson Bull. No. 4. Indiana Dept. of Conservation
Mumford, Russell E. and J.O. Whitaker, Jr. 1982. Mammals of Indiana.
Indiana University Press. Bloomington.
Whitaker, J.O., Jr. 2010. Mammals of Indiana: A Field Guide.
Indiana University Press. Bloomington.
By George Sly
When most people think of Goose Pond Fish and Wildlife Area, they automatically picture birds. It is true; the restoration of the Goose Pond wetlands has resulted in the creation of some of the finest bird habitats in the eastern United States. The opportunity to see the evening influx of thousands of Sandhill Cranes during their Spring migration is an experience both exhilarating and never to be forgotten. What lover of all things wild would not be thrilled by the chance to monitor Bald Eagles rearing their young or watch as they snatch a shad from the surface of a vast marsh? And then there are the rarities. Who would have foreseen this part of Indiana being graced by such rare visitors as the Roseate Spoonbill, Neotropic Cormorant, Wood Stork, Hudsonian Godwit, American Avocet, or Hooded Crane? Yes, Goose Pond FWA certainly deserves its growing reputation as an American birding hotspot.
But, lest we forget, the Goose Pond represents a very large (8000 acres) ecosystem with a variety of habitats and an equally diverse assemblage of animals other than birds. Granted, many of these mammals, reptiles, amphibians, fishes, and invertebrates don’t make themselves as visible as the area’s avifauna. Nevertheless, among these other animal groups there are adaptations, behaviors, and lifestyles sufficient to entertain all of us who have an interest in natural history. With this notion in mind, we hope to periodically offer a glimpse into the lives of some of the Goose Pond’s non-avian fauna. Let’s begin with one of the most archetypical mammals of the wetlands.
On more than one occasion, visitors to Goose Pond FWA have asked, “What in the world are all of those dark-colored mounds protruding from the water?” These masses of rounded vegetation really become apparent in late Fall after much of the emergent vegetation has been culled by the first frosts of the year. Scattered far and wide over the shallow waters, their numbers are quite remarkable.
The mammals who have engineered these structures are muskrats and these are their lodges. It is thought that the name Muskrat has its origins in a Native American appellation for the animal, musquash. Musquash appears in many Native American mythological narratives ( http://www.native-languages.org/legends-muskrat.htm). Coincidentally, the name Muskrat is also a title of practical significance. They use musky secretions from their preputial glands to scent their urine. This is then used, as other with mammals, to mark territorial boundaries and home ranges. Muskrats belong to that large assemblage of mammal species collectively categorized as rodents. Technically speaking, we may think of them as very large mice because they are placed into the same subfamily as voles. Muskrats are the largest of the so-called arvicoline rodents in America.
Indiana muskrats average a little over a pound in weight and about twenty-four inches in total length. Half of this length consists of the tail which is laterally compressed as an adaptation for sculling their way through the water. The hind feet are partially webbed and used for paddling. Muskrat pelage has a dense under-fur. Air trapped in this fur provides the Muskrat both water-proofing and buoyancy. Muskrats, like beavers, can close their lips behind their large central incisors. This is an adaptation which prevents water from entering the mouth while they are feeding.
The aforementioned lodges are constructed from aquatic vegetation. Cattail is a favorite construction material but muskrats will also use plants such as rushes, sedges, and smartweed to build lodges. Inside the lodge there is a chamber which lies above the water line. An underwater entrance leads to this elevated platform and also provides a passageway for escape should danger threaten. Young muskrats are born in these lodge chambers. In Indiana, muskrats have two or three litters per year averaging six young per litter. The life span of muskrats, like many wild mammals, is not long. Only 10-15% of individuals reach an age of one year (Mumford and Whitaker. 1982). Incidentally, muskrats may also burrow into banks and construct dens in lieu of the aquatic lodges.
Muskrats are primarily vegetarians. As one would surmise, their foods are comprised mostly of various aquatic plants. Foods mentioned in Mumford and Whitaker’s Mammals of Indiana include cattails, bulrush, water lilies, pondweeds, smartweeds, sedges, and grasses. Some animal foods may be consumed including dead fish, crayfish, frogs, and mussels. Of course, muskrats have their enemies too. The Mink, a common wetland member of the weasel family, may stalk muskrats along the shore or attack by digging through the side of a lodge. Raccoons, coyotes, domestic dogs, and foxes also kill muskrats. Birds of prey such as the Bald Eagle, Osprey and the larger owls are known to do so as well.
Muskrats have been the quarry of fur trappers for many decades. Hunting and trapping are an integral part of the Goose Pond FWA management plan and so muskrats are taken there too. Locally, the average price for a Muskrat pelt is currently around eight dollars. The GPFWA staff reported that nearly three dozen trappers pursued muskrats there last year and took 1600 “rats”. This represents a value of over twelve thousand dollars in pelts, yet another example of how Goose Pond FWA impacts the local economy.
For those interested in more details of Muskrat natural history the following are quite useful.
Mammals of Indiana: A Field Guide. John O. Whitaker, Jr.
Mammals of Indiana. Russell E. Mumford and John O. Whitaker, Jr.