A common nuisance species in the more northern states, groundhogs dig large burrows which are often complex, with several entry holes. Groundhogs are rodents, and adults average 8-10 pounds. They give birth in spring to 3-6 young. They are primarily herbivorous, eating a variety of plants, including your garden, which is one of the major complaints. They grow fat during the summer, and in winter, they hibernate. They are usually considered a pest due to their burrowing behavior. They are active during the day.