Also known as woodchucks, are large, ground-dwelling rodents. Adults average about ten pounds. They are strictly vegetarians, as many people know, based on the damage in their garden. Groundhogs dig large, complex, interconnecting burrows. They are excellent & prolific diggers. Each spring, a female gives birth to 4-6 young. Groundhogs are true hibernators in the northern parts of their range. The spring emergence always occurs exactly on February 2nd. Oftentimes the groundhog will engage in a behavior known as shadow spotting. Well, perhaps that's not true, but they do emerge in he springtime and resume their digging patterns.