### Identification The Groundhog (*Marmota monax*), or "Whistle-pig," is the heavyweight champion of the squirrel family. Look for a stocky, low-slung rodent (40–65 cm) with a flattened head and a coat of grizzled, brownish-grey fur tipped with frost-like white guard hairs. To distinguish it from western marmots, look at the face and feet: the Groundhog lacks the white "bridge" across the nose seen in Hoary Marmots and sports distinctive black or dark brown "boots" on its sturdy, clawed paws.
### Habitat & Range This is a creature of the "edge." They thrive where open fields, pastures, or suburban lawns meet the protective cover of woodlots. While most marmots are alpine specialists, *M. monax* is a lowland generalist, ranging from the eastern United States across the Canadian provinces and up into Alaska.
### Behaviour Keep your binoculars ready during the early morning or late afternoon. You’ll likely spot them standing bolt upright like furry sentinels near their burrow entrances. Unlike their social mountain cousins, Groundhogs are fiercely solitary. They are "true" hibernators; by October, they retreat to specialized winter dens below the frost line, not emerging until the first hints of spring. If startled, listen for a sharp, high-pitched whistle—their signature alarm call.
### Diet Groundhogs are voracious herbivores. They spend their summer "vacuuming" up succulent greens, including clover, alfalfa, plantains, and—much to the chagrin of gardeners—prized lettuce and tomatoes. They rarely drink water, obtaining most of their hydration from the dewy vegetation they consume.
### Fascinating Fact Despite their chunky, terrestrial appearance, Groundhogs are surprisingly athletic! When threatened or in pursuit of a tasty fruit, they are skilled tree climbers and capable swimmers, proving they are far more than just "dirt-diggers."