Some animals that live underground are worms, moles and prairie dogs. Worms and moles live underground full time, while prairie dogs and chipmunks do spend time above ground.
Animals that burrow and live underground are called fossorial animals. These creatures live underground to protect themselves from predators, overly dry climates and/or extreme temperatures. They also find food underground, including plant materials, insects and insect eggs.
It is often possible to identify an animal by the type and size of hole it creates in the ground. A chipmunk hole is about the size of a silver dollar and cleanly dug, and a prairie dog leaves a taller lip of soil around the hole it digs.