Groundhogs do not simply crawl into their dens and hibernate, but rather they experience a series of torpor and arousal events throughout winter.

Hibernation helps survival In my study area in southeastern Pennsylvania, the average date groundhogs emerge from their burrows is February 4. This fits the folklore and the timing of Groundhog Day.

That way they have enough time to gain sufficient weight to survive their first winter hibernation. But why do groundhogs emerge in February, when mating won't occur until next month?

Why do groundhogs emerge on Feb. 2 if it’s not to predict the weather? Research into groundhog biology shows they have other priorities in early February than mingling with the people of Punxsutawney, ...

As food supplies become scarce in the colder months, groundhogs burrow away as a mode of survival. But how do their bodies react to the harsh winter temperatures while they sleep? Groundhogs are ...

This morning (Feb. 2), a groundhog will not predict the weather. Anyway, what will groundhogs not kept in captivity for the sake of odd secular holidays do if winter conditions persist into March ...

On February 2nd, groundhogs don’t emerge to predict the weather, but to predict whether their own mating season will be a success!

As food supplies become scarce in the colder months, groundhogs burrow away as a mode of survival. But how do their bodies react to the harsh winter temperatures while they sleep? Groundhogs are ...

According to legend, if the groundhog sees his shadow on February 2nd, there will be six more weeks of winter; if not, an early spring is predicted.

As food supplies become scarce in the colder months, groundhogs burrow away as a mode of survival. But how do their bodies react to the harsh winter temperatures while they sleep? Groundhogs are ...

As food supplies become scarce in the colder months, groundhogs burrow away as a mode of survival. But how do their bodies react to the harsh winter temperatures while they sleep? Groundhogs are ...

As food supplies become scarce in the colder months, groundhogs burrow away as a mode of survival. But how do their bodies react to the harsh winter temperatures while they sleep? Groundhogs are ...