Every February 2nd, people in the United States wait to see if Punxsutawney Phil, a groundhog living in Punxsutawney, Pennsylvania, will see his shadow and predict six more weeks of cold weather. But how can a groundhog predict the weather? And if it's winter, shouldn't he be hibernating? Are such predictions really accurate? Why is February 2nd so special? And do other groundhogs predict the weather?

Groundhog sees its shadow - or not -- Reason for seasons -- Deep in the earth -- Do groundhogs really wake up in February? -- Beginnings of Groundhog Day -- More that Punxsutawney Phil? -- Six more weeks of winter? -- Have a Groundhog Day party!