Porcupine
- Wikipedia provides details of the Old World family Hystricidae and the New World family Erethizontidae.
- http://en.wikipedia.org/wiki/Porcupine

North American Porcupine
- Photograph and information on this species including its description, behavior and life cycle.
- http://www.desertusa.com/mag99/mar/papr/porcupine.html

African Brush-tailed Porcupine - Wikipedia
- Description of Atherurus africanus, which is one of the biggest rodents found on the continent.
- http://en.wikipedia.org/wiki/African_Brush-tailed_Porcupine

North American Porcupine - Erethizon dorsatum
- Illustrated introduction to the species, including its characteristics, range, habitat, diet, life cycle, and behavior.
- http://www.nhptv.org/natureworks/porcupine.htm

Porcupine - Erethizon dorsatum
- Photo, description, biological information, and drawings and description of this animal's tracks.
- http://www.bcadventure.com/adventure/wilderness/animals/porcup.htm

Porcupine (Erethizon dorsatum)
- Description, photo, habits, and distribution in Texas.
- http://www.nsrl.ttu.edu/tmot1/eretdors.htm

Family Erethizontidae (New World Porcupines)
- Description of this family of rodents, consisting of four genera and twelve species found in the Americas.
- http://animaldiversity.ummz.umich.edu/site/accounts/information/Erethizontidae.html

Porcupine (Erethizon dorsatum bruneri)
- Description, life cycle, habits, and other information, with photo.
- http://www.ku.edu/~mammals/erethizon.html