| Groundhog | |
|---|---|
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| Groundhog atLaval University campus,Quebec, Canada | |
Scientific classification | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Mammalia |
| Order: | Rodentia |
| Family: | Sciuridae |
| Genus: | Marmota |
| Species: | M. monax |
| Binomial name | |
| Marmota monax | |
| Subspecies | |
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| Groundhog range in North America | |
| Synonyms | |
Mus monaxLinnaeus, 1758 | |
Thegroundhog (Marmota monax), also known as thewoodchuck, is arodent of the familySciuridae, belonging to the group of largeground squirrels known asmarmots.[2] A lowland creature of North America, it is found through much of theEastern United States, acrossCanada and intoAlaska.[3] It was given its scientific name asMus monax byCarl Linnaeus in 1758,[4] based on a description of the animal byGeorge Edwards, published in 1743.[5]
The groundhog plays an important role maintaining healthy soil inwoodlands andplains; as such, the species is considered a crucialhabitat engineer.[6][7][8] The groundhog is an extremelyintelligent animal, forming complexsocial networks andkinship with its young; it is capable of understandingsocial behavior,communicating threats throughwhistling, and workingcooperatively to accomplish tasks such asburrowing.[9][10]
Common names for the groundhog includechuck,wood-shock,groundpig,whistle-pig,[11]whistler,thickwood badger,Canada marmot,monax,moonack,weenusk,red monk,[12]: 300 land beaver[13] and, among French Canadians ineastern Canada,siffleux.[14] The name "thickwood badger" was given in the Northwest to distinguish the animal from theprairie badger. Monax (Móonack) is anAlgonquian name of the woodchuck, which means "digger" (cf.Lenapemonachgeu).[15][12]: 300–301 Young groundhogs may be called chucklings.[16]: 66
The etymology of the namewoodchuck is unrelated towood or any sense ofchucking. It stems from anAlgonquian (possiblyNarragansett) name for the animal,wuchak.[17] The similarity between the words has led to the populartongue-twister:[18]
The groundhog is the largestsciurid in its geographical range, excluding its presence inBritish Columbia where its range may be comparable to that of its somewhat larger cousin, thehoary marmot. Adults may measure from 41.8 to 68.5 cm (16+7⁄16 to26+15⁄16 in) in total length, including a tail of9.5 to 18.7 cm (3+3⁄4 to7+3⁄8 in).[19][20][21] Weights of adult groundhogs typically fall between 2 and 6.3 kg (4 lb 7 oz and 13 lb 14 oz).[21][22][23]
Male groundhogs are slightly larger than females on average and, like all marmots, they are considerably heavier during autumn (when engaged inautumn hyperphagia) than when they emerge from hibernation in spring. Adult males average year-around weight 3.83 kg (8 lb 7 oz), with spring to fall average weights of 3.1 to 5.07 kg (6 lb 13 oz to 11 lb 3 oz) while females average 3.53 kg (7 lb 13 oz), with spring to fall averages of 3.08 to 4.8 kg (6 lb 13 oz to 10 lb 9 oz).[19][24] Seasonal weight changes reflectcircannual deposition and use of fat. Groundhogs attain progressively higher weights each year for the first two or three years, after which weight plateaus.[19]
Groundhogs have fourincisors, which grow1.5 millimetres (1⁄16 in) per week. Constant usage wears them down by about that much each week.[25] Unlike the incisors of many other rodents, the incisors of groundhogs are white to ivory-white.[26][16]: 20 Groundhogs are well-adapted for digging, with powerful, short legs and broad, long claws. The groundhog's tail is shorter than that of other Sciuridae—only about one-fourth of body length.
The groundhog dwells in lowland habitats, unlike other marmots that live in rocky and mountainous areas.Marmota monax has a wide geographic range. The groundhog prefers open country and the edges of woodland, being rarely found far from a burrow entrance.[27] It can typically be found in small woodlots, low-elevation forests, fields and pastures, and hedgerows. It constructs dens in well-drained soil, and most groundhogs have summer and winter dens. Human activity has increased food access and abundance, allowingM. monax to thrive.[28]
W.J. Schoonmaker reports that groundhogs may hide when they see, smell, or hear an observer.[16]: 41–43 Marmot researcher Ken Armitage states that the social biology of the groundhog is poorly studied.[29]Despite their heavy-bodied appearance, groundhogs are accomplished swimmers and occasionally climb trees when escaping predators or when they want to survey their surroundings.[30] They prefer to retreat to their burrows when threatened; if the burrow is invaded, the groundhog tenaciously defends itself with its two largeincisors and front claws. Groundhogs are generallyagonistic and territorial toward conspecifics and may skirmish to establish dominance.[31][16]: 93 Outside their burrow, individuals are alert when not actively feeding. It is common to see one or more nearly motionless individuals standing erect on their hind feet watching for danger. When alarmed, they use a high-pitched whistle to warn the rest of the colony, hence the name "whistle-pig".[32][33] Groundhogs may squeal when fighting, seriously injured, or caught by a predator.[33] Other vocalizations include low barks and a sound produced by grinding their teeth.[33]David P. Barash wrote that he witnessed only two occasions of upright play-fighting among woodchucks and that the upright posture of play-fighting involves sustained physical contact between individuals that may require a degree of social tolerance virtually unknown inM. monax. Alternatively, upright play-fighting may be a part of the woodchuck's behavioral repertoire that rarely is shown because of physical spacing and/or low social tolerance.[34]: 97
Mostlyherbivorous, groundhogs eat primarily wild grasses and other vegetation, including berries, bark, leaves, and agricultural crops, when available.[31][35] In early spring,dandelion andcoltsfoot are important groundhog food items. Some additional foods includesheep sorrel,timothy-grass,buttercup,persicaria,agrimony, red and blackraspberries,mulberries,buckwheat,plantain,wild lettuce,alfalfa, and all varieties ofclover. Groundhogs also occasionally eat small animals, such asgrubs,grasshoppers,snails, and even bird eggs and baby birds, but are not asomnivorous as many otherSciuridae.[35][36]
An adult groundhog can eat more than 1 lb (0.45 kg) of vegetation daily.[37] In early June, woodchucks'metabolism slows, and while their food intake decreases, their weight increases by as much as 100% as they produce fat deposits to sustain them during hibernation and late winter.[38] Instead of storing food, groundhogs stuff themselves to survive the winter without eating.[39] Thought not to drink water, groundhogs are reported to obtain needed liquids from the juices of edible plants, aided by their sprinkling with rain or dew.[16]: 85 [40][12]: 308
Groundhogs are excellent burrowers, using burrows for sleeping, rearing young, andhibernating. Groundhog burrows usually have two to five entrances, providing groundhogs their primary means of escape from predators. The volume of earth removed from groundhog burrows in one study averaged 6 cubic feet (0.17 m3) per den. The longest burrow measured 24 feet (7.3 m) in addition to two short side galleries.[16]: 108–109
Though groundhogs are the most solitary of the marmots, several individuals may occupy the same burrow.
Burrows can pose a serious threat to agricultural and residential development by damaging farm machinery and even undermining building foundations.[32] In a June 7, 2009, Humane Society of the United States article, "How to Humanely Chuck a Woodchuck Out of Your Yard" by John Griffin, director of Humane Wildlife Services, stated you would have to have a lot of woodchucks working over a lot of years to create tunnel systems that would pose any risk to a structure.[citation needed]
The burrow is used for safety, retreat in bad weather, hibernating, sleeping, mating, and nursery. In addition to the nest, there is an excrement chamber. The hibernation or nest chamber is lined with dead leaves and dried grasses.[41] The nest chamber may be about twenty inches to three feet (51–91 cm) below ground surface. It is about 16 inches (41 cm) wide and 14 inches (36 cm) high. There are typically two burrow openings or holes. One is the main entrance, the other a spy hole. Description of the length of the burrow often includes side galleries. Excluding side galleries, Schoonmaker reports the longest was 24 feet (7.3 m), and the average length of eleven dens was 14 feet (4.3 m).[16]: 104–105 W. H. Fisher investigated nine burrows, finding the deepest point 49 inches (120 cm) down. The longest, including side galleries, was 47 ft 11.5 in (14.62 m).[12]: 306 Numbers of burrows per individual groundhog decrease withurbanization.[42][43]
Bachman mentioned when young groundhogs are a few months old, they prepare for separation, digging a number of holes in the area of their early home. Some of these holes were only a few feet deep and never occupied, but the numerous burrows gave the impression that groundhogs live in communities.[12]: 318
Abandoned groundhog burrows benefit many other species by providing shelter. They are used bycottontail rabbits,raccoons,foxes,river otters,eastern chipmunks, and a wide variety of small mammals, snakes, and birds.[44]
Groundhogs are one of the few species that enter into truehibernation, and often build a separate "winter burrow" for this purpose. This burrow is usually in a wooded or brushy area and is dug below thefrost line and remains at a stable temperature well above freezing during the winter months. In most areas, groundhogs hibernate from October to March or April, but in more temperate areas, they may hibernate as little as three months.[45] Groundhogs hibernate longer in northern latitudes than southern latitudes.[46][47] To survive the winter, they are at their maximum weight shortly before entering hibernation.[48] When the groundhog enters hibernation, there is a drop in body temperature to as low as 35 degrees Fahrenheit (2 °C), heart rate falls to 4–10 beats per minute and breathing rate falls to one breath every six minutes.[49] During hibernation, they experience periods of torpor and arousal.[50] Hibernating woodchucks lose as much as half their body weight by February.[51] They emerge from hibernation with some remaining body fat to live on until the warmer spring weather produces abundant plant materials for food.[48] Males emerge from hibernation before females.[52][16]: 50 Groundhogs are mostlydiurnal and are often active early in the morning or late afternoon.[53]
Groundhogs are considered the mostsolitary of themarmot species. They live in aggregations, and their social organization also varies acrosspopulations. Groundhogs do not form stable, long-term pair-bonds, and duringmating season male-female interactions are limited tocopulation. InOhio, adult males and females associate with each other throughout the year and often from year to year.[54][19] Usually groundhogsbreed in their second year, but a small proportion may breed in their first. Thebreeding season extends from early March to mid- or late April, after hibernation. Woodchucks are polygynous[28] but only alpine and woodchuck marmot females have been shown to mate with multiple males.[54] A mated pair remains in the same den throughout the 31- to 32-daygestation period.[55] As birth of the young approaches in April or May, the male leaves the den. One litter is produced annually. Female woodchucks give birth to one to nine offspring, with most litters ranging between 3 and 5 pups.[28] Groundhog mothers introduce their young to the wild once their fur is grown in and they can see. At this time, if at all, the father groundhog comes back to the family.[12]: 316 By the end of August, the family breaks up; or at least, the larger number scatter, to burrow on their own.[12]: 318
In the wild, groundhogs can live up to six years with two or three being the average life expectancy. In captivity, groundhogs reportedly live up to 14 years. Human development often leaves vacant space nearsecondary forests, which are indigenous to groundhogs, which ensures that groundhogs in well-developed areas are nearly free of predators other thanhumans (through various forms of pest control orvehicular incursion) or mid-to-large sizeddogs.[56]
Occasionally, woodchucks may suffer fromparasitism, and a woodchuck may die from infestation or from bacteria transmitted byvectors.[57] In areas of intensive agriculture and the dairying regions of the state of Wisconsin, particularly in southern areas, the woodchuck had been almost extirpated by 1950.[58]: 124 Jackson (1961) suggested that exaggerated reports of damage done by the woodchuck led to excessive culling, substantially reducing its numbers in the state.
In some areas woodchucks are important game animals and are killed regularly for sport, food, or fur. In Kentucky, an estimated 267,500M. monax were taken annually from 1964 to 1971.[59]: 143 Woodchucks had protected status in the state of Wisconsin[60] until 2017.[61] Woodchuck numbers appear to have decreased in Illinois.[62]
Wild predators of adult groundhogs in most of easternNorth America includecoyotes,badgers,[63]bobcats, andfoxes (largelyred fox). Many of these predators are successful stealth stalkers that catch groundhogs by surprise before they can escape to their burrows; badgers likely hunt them by digging them out from their burrows. Coyotes in particular are sizable enough to overpower any groundhog with the latter being the third most significant prey species per a statewide study inPennsylvania.[64][65][66][67][68][69]
Large predators such asgray wolf andeastern cougar are likelyextirpated in the east but still may hunt groundhogs on occasion inCanada.[70][71]Golden eagles can also prey on adult groundhogs, but seldom occur in the same range or in the same habitats as this marmot. Likewise,great horned owls can reportedly, per Bent (1938), prey upon groundhogs but rarely do so, given the temporal differences in their behaviors.[72][73]
Young groundhogs (usually those less than a couple months in age) may also be taken by theAmerican mink, and perhaps other smallmustelids,cats,timber rattlesnakes, andhawks.Red-tailed hawks can take groundhogs at least of up to the size of yearling juveniles, andnorthern goshawks can take them up to perhaps weak emergent-adult groundhogs in the Spring.[19][21][74][75][76]
Beyond their large size, groundhogs have several successful anti-predator behaviors, usually retreating to the safety of their burrow which most predators will not attempt to enter, but also being ready to defend themselves with their sharp claws and large incisors. They can also scale trees to escape a threat.[59]: 142–143 [77][failed verification][42][failed verification]
Both their diet and their habit of burrowing make groundhogs serious nuisance animals around farms and gardens. They will eat many commonly grown vegetables. Extensive burrowing can undermine foundations.[32]
Very often, the dens of groundhogs provide homes for other animals, includingskunks,red foxes, andcottontail rabbits. Foxes and skunks feed uponfield mice,grasshoppers,beetles, and other creatures that destroy farm crops. In aiding these animals, the groundhog indirectly helps the farmer. In addition to providing homes for itself and other animals, the groundhog aids in soil improvement by bringingsubsoil to the surface. The groundhog is also a valuable game animal and is considered a difficult sport when hunted in a fair manner.[16]: 129–131 In some parts of the U.S., they have been eaten.[78]
A report in 1883 by the New Hampshire Legislative Woodchuck Committee describes the groundhog's objectionable character:[12]: 328 [79]
The woodchuck, despite its deformities both of mind and body, possesses some of the amenities of a higher civilization. It cleans its face after the manner of the squirrels, and licks its fur after the manner of a cat. Your committee is too wise, however, to be deceived by this purely superficial observation of better habits. Contemporaneous with the ark, the woodchuck has not made any material progress in social science, and it is now too late to reform the wayward sinner. The average age of the woodchuck is too long to please your committee.... The woodchuck is not only a nuisance, but also a bore. It burrows beneath the soil, and then chuckles to see a mowing machine, man and all, slump into one of these holes and disappear....
The committee concludes that, "a small bounty will prove of incalculable good; at all events, even as an experiment, it is certainly worth trying; therefore your committee would respectfully recommend that the accompanying bill be passed."[16]: 133
Groundhogs may be raised in captivity, but their aggressive nature can pose problems. Doug Schwartz, a zookeeper and groundhog trainer at theStaten Island Zoo, has been quoted as saying "They're known for their aggression, so you're starting from a hard place. His natural impulse is tokill 'em all and let God sort 'em out. You have to work to produce the sweet and cuddly."[80] Groundhogs cared for inwildlife rehabilitation that survive but cannot be returned to the wild may remain with their caregivers and become educational ambassadors.[81][82][83]
In the United States and Canada, the yearlyGroundhog Day celebration on February 2 has given the groundhog recognition and popularity. The most popularly known of these groundhogs arePunxsutawney Phil,Wiarton Willie,Shubenacadie Sam, Jimmy the Groundhog,Dunkirk Dave, andStaten Island Chuck kept as part of Groundhog Day festivities inPunxsutawney, Pennsylvania;Wiarton, Ontario;Sun Prairie, Wisconsin;Dunkirk, New York; andStaten Island respectively. The 1993 comedy filmGroundhog Day references several events related to Groundhog Day, and portrays both Punxsutawney Phil himself, and the annual Groundhog Day ceremony. FamousSouthern groundhogs includeGeneral Beauregard Lee, based atDauset Trails Nature Center outsideAtlanta, Georgia.[84]
Groundhogs are used in medical research onhepatitis B-inducedliver cancer. A percentage of the woodchuck population is infected with the woodchuck hepatitis virus (WHV), which is similar to human hepatitis B virus. Humans cannot contract hepatitis from woodchucks with WHV, but the virus and its effects on the liver make the woodchuck the best available animal for the study of viral hepatitis in humans. The only other animal model for hepatitis B virus studies is the chimpanzee, an endangered species.[85] Woodchucks are also used in biomedical research investigatingmetabolic function,obesity,energy balance, theendocrine system,reproduction,neurology,cardiovascular disease,cerebrovascular disease, andneoplastic disease.[86] Researching the hibernation patterns of groundhogs may lead to benefits for humans, including lowering of the heart rate in complicated surgical procedures.[87]
Groundhog burrows have revealed at least twoarchaeological sites, theUfferman Site in the U.S. state ofOhio[88] andMeadowcroft Rockshelter inPennsylvania. Archaeologists have neverexcavated the Ufferman Site, but the activities of local groundhogs have revealed numerousartifacts. They favor the loose soil of theesker at the site lies, and their burrow digging has brought many objects to the surface: human and animal bones, pottery, and bits of stone.[88] Woodchuck remains were found in the Indian mounds atAztalan, Jefferson County, Wisconsin.[58]: 124
Robert Frost's poem "A Drumlin Woodchuck" uses the imagery of a groundhog dug into a small ridge as ametaphor for his emotionalreticence.[89]
