Groundhogs are furry animals about the size of a cat. They are also called "woodchucks" or "whistle pigs".
Groundhogs spend most of their time underground. They use their strong limbs and sharp claws to dig tunnels and burrows (big holes).
These underground burrows are very important. That's where groundhogs sleep and have their babies in the spring. The burrows are a good place to hide from their enemies. Coyotes, black bears, foxes, and hawks like to snack on groundhogs.
When the weather is good, groundhogs spend a lot of time eating. They like grasses, berries, clover, and tree bark. They love eating alfalfa and are sometimes a pest to farmers.
Why do groundhogs eat so much? They have to store up fat to be ready for their long winter nap called a "hibernation". For about 3 or 4 months they go into a very deep sleep. Their breathing slows down so much, you can barely tell they are alive.