Also known as a "whistlepig" and a "thickwood badger," groundhogs are now synonymous with shadows and spring weather. But there's more to know.

Here's all you need to know about Groundhog Day. What is it, how it works, and which are the most accurate groundhogs in the U.S.

Here’s what to know about the weather-forecasting tradition.

Punxsutawney Phil, a Pennsylvania groundhog who started the annual tradition in the late 1800s, is the most famous ...