- Groundhogs at HogHaven
 - The saga and pictures of the Duke and Dutchess, as well as other groundhog cubs. - Woodchuck - Fermilab Flora and Fauna Exhibit
- Information about the woodchuck, Marmota monax, is also called the groundhog or the whistle-pig.
- 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.
- 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 - Hinterland Who's Who
- Canadian Wildlife Service article about the groundhog, a rodent that belongs to the large group of mammals Rodentia, which includes squirrels, prairie dogs, and chipmunks.
- Woodchuck - Missouri Mammals
- Profile of the woodchuck, or groundhog, is one of the best known wild mammals in Missouri.
- Woodchucks - The Humane Society of the United States
- Article about the powerful tunnelers know as woodchucks, groundhogs, or whistle-pigs.
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