http://www.news.cornell.edu/Chronicl....96/facts.html
What's so special about Feb. 2?
Celestially speaking, Groundhog Day on Feb. 2 is a "cross-quarter" day, about halfway between the winter solstice in December and the ver nal equinox in March, and is celebrated in some cultures as the mid point of winter. It's not far from the time many groundhogs end their hi bernation anyway, around the second week of February.
What's the wake-up call?
The groundhog's internal clock is believed to be affected by annual changes in the amount of daylight. Hormonal responses to cyclic changes in production of melatonin, a sleep-related hormone, are thought by some to be the signal to wake up.
How much wood could a woodchuck chuck if a woodchuck could chuck wood?
About 700 pounds. Compared to beavers, groundhogs/woodchucks are not adept at moving timber, although some will chew wood. (At Cornell, woodchucks that gnaw their wooden nest boxes are given scraps of 2-by-4 lumber.) A wildlife biologist once measured the inside volume of a typical woodchuck burrow and estimated that -- if wood filled the hole instead of dirt -- the industrious animal would have chucked about 700 pounds' worth.
From what else I can find- Phil is right 40 percent of the time... which for a groundhog, I guess that sucks...