Tradition states that one must observe a groundhog's burrow on this day. If the groundhog emerges and fails to see its shadow because the weather is cloudy, winter will soon end; however, if the groundhog sees its shadow because the weather is bright and clear, it will be frightened and run back into its hole, and the winter will continue for six more weeks.
A famous groundhog is Punxsutawney Phil from Punxsutawney, Pennsylvania (the movie Groundhog Day with Bill Murray takes place there).
- Top 10 Reasons to Celebrate Groundhog Day
- some links about the Groundhog Day and his history on dmoz.org
- Wikipedia:Groundhog_Day
- DeWikipedia:Groundhog_Day