Is it a Groundhog or a Woodchuck? The groundhog is also known as a woodchuck. Depending on the area they are also known as whistle-pig or land-beaver. The groundhog belongs to the group of large ground squirrels known as marmots. The burrows that they dig are used for sleeping, raising young and for hibernating. The groundhog burrows can be large with almost 50 feet of tunnels, with usually two to five entrances. The tunnels they dig can be buried up to five feet deep. The tunnels cause havoc with lawns, farm land and may even undermine building foundations. Do you have tunnels ruining your lawn? Call your local Critter Control office at 1-800-CRITTER.