Groundhog - Wikipedia
Article about the groundhog (also known as the woodchuck, or whistlepig), a rodent of the family Sciuridae, belonging to the group of large ground squirrels known as marmots.
Groundhogs at HogHaven
The saga and pictures of the Duke and Dutchess, as well as other groundhog cubs.
Woodchuck (Marmota monax)
Learn about the groundhog, the sciurid with a heavy, chunky body set atop short but powerful legs well adapted for digging. ADW includes photos of groundhogs and information on related species.
Woodchuck - Missouri Mammals
Profile of the woodchuck, or groundhog, is one of the best known wild mammals in Missouri.