Woodchuck (Marmota monax)
- Lists the range of the woodchuck (groundhog), habits, what their tracks look like, foods they eat, and information about hibernation and reproduction. Funded by the Missouri Conservation Commission.
- http://mdc.mo.gov/nathis/mammals/woodchuck/

Official Groundhog Site
- Games, contests, prediction records, links, and Punxsutawney Phil's family.
- http://www.groundhogs.com/

Woodchuck or Groundhog Fact Sheet
- Fact sheet from Maryland Animal Bits.
- http://www.dnr.state.md.us/wildlife/abwoodchuck.html

Groundhogs Day
- Information about the animal and the traditions surrounding Groundhogs' Day.
- http://ona.cabe.k12.wv.us/groundhog.html

Groundhogs at HogHaven
- Learn all about a colony of groundhogs that live in Delaware. Includes videos, sounds, pictures, and stories.
- http://www.hoghaven.com/