Traditionally, the groundhog is supposed to wake up on February 2, and come up out of his burrow. If he sees his shadow, he will return to the burrow for six more weeks of winter. If he doesn’t see his shadow, he remains outside and starts his year, because he knows that spring has arrived early. In the U.S., the “official” groundhog is kept in Punxsutawney, Pennsylvania and is called “Phil.” Though not based in science, it is a fun US tradition.