Opossum
- Information on this species, the only marsupial in the United States, including a description, its habits, foods and reproduction.
- http://www.holoweb.com/cannon/opossum.htm

Opossum Society of the United States
- Non-profit wildlife rehabilitation and educational organization dedicated to providing care for injured and orphaned wild opossums.
- http://www.opossumsocietyus.org/

Opossum: Our Marvelous Marsupial, The Social Loner
- A personal look at the opossum.
- http://www.wildliferescueleague.org/report/opossum.html