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:''For other uses see groundhog (disambiguation) and woodchuck (disambiguation)''
The 'groundhog' (''Marmota monax''), also known as the 'woodchuck,' 'land beaver,' or 'whistlepig', is a rodent of the family Sciuridae, belonging to the group of large ground squirrels known as marmots. Most marmots, such as yellow-bellied and hoary marmots, live in rocky and mountainous areas, but the woodchuck is a lowland creature. It is widely distributed in North America and common in the northeastern and central United States. In the west it is found only in Alaska, Alberta, British Columbia, and northern Washington.

Contents

Anatomy and behavior

Popular culture

Notes

References

External links

Video

Anatomy and behavior

The groundhog is the largest sciurid in its geographical range, typically measuring 40 to 65 cm (17 to 26 in) long (including a 15 cm tail) and weighing 2 to 4 kg (4.5 to 9 pounds). In areas with fewer natural predators and large quantities of alfalfa, groundhogs can grow to 80 cm (32 in) and 14 kg (30 lb). Groundhogs are well adapted for digging, with short but powerful limbs and curved, thick claws. Similarly, the spinal structure of the groundhog is curved in a manner that resembles a mole rather than other sciurids. The tail measures only about one-fourth of body length, much shorter than that of other sciurids. Suited to their temperate habitat, groundhogs are covered with two coats of fur: a dense grey undercoat and a longer coat of banded guard hairs that gives the groundhog its distinctive "frosted" appearance. Like other sciurids, groundhogs have exceptionally dense cerebral bones, allowing them to survive direct blows to the head that would cripple other mammals of the same body mass.
Groundhogs usually live from two to three years, but can live up to six years in the wild, and up to ten years in captivity. Common predators for groundhogs include wolves, coyotes, bobcats, bears, large hawks, and owls. Young groundhogs are often at risk for predation by snakes, which easily enter the burrow.
Generally herbivorous, groundhogs subsist primarily on wild grasses and other vegetation, supplementing their diet with berries and agricultural crops when available.^[1] Though not as omnivorous as many other sciurids, groundhogs will also eat grubs, grasshoppers, insects, snails and other small animals.

Groundhogs are excellent burrowers, using burrows for sleeping, rearing young, and hibernating. The average groundhog has been estimated to move approximately 1 m³ (35 cubic feet), or 320 kg (700 pounds), of dirt when digging a burrow. Though groundhogs are the most solitary of the marmots, several individuals may occupy the same burrow. Groundhog burrows generally have between two and five entrances, providing groundhogs their primary means of escape from predators. Burrows are particularly large, with up to 45 feet of tunnels buried up to 5 feet underground, and can pose a serious threat to agricultural and residential development by damaging farm machinery and even undermining building foundations.^[2]
Groundhogs are one of the few species that enter into true hibernation, and often build a separate "winter burrow" for this purpose. Usually situated in a wooded or brushy area, the winter burrow is dug below the frost line and remains at a stable temperature well above freezing during the cold winter months. In most areas, groundhogs go into hibernation during October and emerge during the months of March and April; in more temperate regions, their hibernation period may be as short as 3 months.^[3] To survive the winter, they are at their maximum weight shortly before entering hibernation. They emerge from hibernation with some remaining body fat to live off of until the warmer spring weather produces abundant plant materials for food sources.
Despite their heavy-bodied appearance, groundhogs are accomplished swimmers and climbers, and will climb trees to escape predators or survey their surroundings.^[4] However, groundhogs prefer to retreat to their burrows when threatened; if the burrow is invaded, the groundhog will tenaciously defend itself with its two large incisors and front claws. Additionally, groundhogs are generally agonistic and territorial among their own species, and may skirmish to establish dominance.
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.^[5]

Groundhogs feed on a variety of plants such as grass, clover, and berries.

Usually groundhogs breed in their second year, but a small percentage may breed as yearlings. The breeding season extends from early March to middle or late April, following hibernation. A mated pair will remain in the same den throughout the 28-32 day gestation period. As birth of the young approaches in April or May, the male will leave the den. One litter is produced annually, usually containing 2-6 blind, hairless and helpless young. Young groundhogs are weaned and ready to seek their own dens at five to six weeks of age.

Groundhogs prefer open areas and woodland edges.

The groundhog prefers open country and the edges of woodland, and it is rarely far from a burrow entrance. Since the clearing of forests provided it with much more suitable habitat, the groundhog population is probably higher now than it was before the arrival of European settlers in North America. Groundhogs are often hunted for sport, which tends to control their numbers. However, their ability to reproduce quickly has tended to mitigate the depopulating effects of sport hunting.² As a consequence, the groundhog is a familiar animal to many people in the United States and Canada.
Groundhogs raised in captivity can be socialized relatively easily; however, their aggressive nature can pose problems. Doug Schwartz, a zookeeper and groundhog trainer at the Staten Island Zoo, has been quoted as saying "They’re known for their aggression, so you’re starting from a hard place. [Their] natural impulse is to kill ’em all and let God sort ’em out. You have to work to produce the sweet and cuddly."^[6]

Popular culture

In the United States and Canada, the annual Groundhog Day celebration has given the groundhog some added recognition and popularity.
The etymology of the name ''woodchuck'' is unrelated to wood. It stems from an Algonquian name for the animal (possibly Narragansett), ''wuchak''. The apparent relationship between the two words has led to the common tongue twister: "How much wood would a woodchuck chuck if a woodchuck could chuck wood? — A woodchuck would chuck all the wood that a woodchuck could if a woodchuck could chuck wood". Other response lines can be used, including:
#"As much wood as a woodchuck would if a woodchuck could chuck wood."^[7]
#"A woodchuck would chuck as much wood as a woodchuck could chuck, if a woodchuck could chuck wood."^[8]

Notes

1. Mammals of the Eastern United States, , John O, Whitaker, Cornell University Press, ,
2. Animal Diversity Web : Marmota monax (University of Michigan Museum of Zoology)
3. Woodchucks in Rhode Island (Rhode Island Department of Environmental Management)
4. Wild Mammals of North America, Biology, Management, Economics, , J.A., Chapman, Johns Hopkins University Press, ,
5. Hinterland Who's Who ("Canadian Wildlife Service: Mammals: Woodchuck")
6. Andy Newman, Grooming a Weatherman for His TV Debut, and Hoping He Doesn't Bite the Host. New York Times, January 12 2007]
7. Jackie Silberg (2003), ''The Learning Power of Laughter'', Page 23
8. Laura Rountree Smith (1923), ''Two Hundred Games that Teach'', Page 63

References

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External links

Video

★ Hinterland Who's Who ("Canadian Wildlife Service: Mammals: Woodchuck")

★ Missouri Conservation Commission ("Woodchuck")