Fermilab Woodchucks
- Fermilab, in Illinois, has woodchucks (also known as groundhogs) that live happily on the lab's 6,800 acres.
- http://ed.fnal.gov/entry_exhibits/woodchuck/woodchuck.html

Groundhog.org
- History of the holiday, Punxsutawney Phil's predictions since 1887, and fun groundhog facts.
- http://www.groundhog.org/faq/

FactMonster: Groundhog Day
- Offers a simple history of the observance.
- http://www.factmonster.com/spot/groundhogday1.html

Wiarton Willie
- Canada's answer to Punxsutawney Phil.
- http://www.southbrucepeninsula.com/index.cfm?member=willie

Groundhog Day History
- With folklore and winter weatherlore, from stormfax.com.
- http://www.stormfax.com/ghogday.htm

Groundhogs at HogHaven
- Learn all about a colony of groundhogs that live in Delaware.
- http://www.hoghaven.com/

Dunkirk Dave's Groundhog Haven
- Information about groundhog Dunkirk Dave and other groundhogs in captivity and in the wild; links to other groundhog sites.
- http://www.dunkirkdave.com/