It is a German tradition to have a groundhog tell you the weather. Basically, he is hibernating (and is one of the only animals who actually does so)! He is forced out of his hole, and if he sees his shadow, he gets scared and jumps back into his hole to sleep longer! If he does not see his shadow, he figures the weather will be nice (an early spring) and stays awake.
Most of us have heard of Punxsutawney Phil, but here are some other weather forecasting groundhogs you might not know! The full article from About.com (where I copied all of this information) can be found by clicking here!
Check these out...some of them are pretty funny! Some of the links inside the descriptions will actually tell you about each, while others will take you to the website for each groundhog's home, fyi.
It made me think...if Indiana had its own groundhog, what would we name it?