The Groundhog is a rodent. It is also called a woodchuck. It belongs to the group of ground squirrels. Those squirrels are also known as marmots. The animal may also be called Woodchuck, or Whistlepig. Groundhogs dig tunnels and live underground. Groundhog holes, called burrows, are easy to recognize; they are holes, about 9.in (inches) (23 cm (centimeters)) wide which usually have large piles of dirt and rocks at the entrance. Every single hole, may have tunnels which lead to as many as ten other holes, the tunnels are very large and can have chambers, like rooms, in them. Groundhogs can make their homes under trees, around buildings and in open fields.