http://www.sandiegozoo.org/animalbytes/t-warthog.html

http://www.awf.org/content/wildlife/detail/warthog

http://www.zooatlanta.com/animals_warthog.htm

http://animals.nationalgeographic.com/animals/mammals/warthog.html

http://kids.nationalgeographic.com/Animals/CreatureFeature/Warthog

http://www.oaklandzoo.org/animals/mammals/warthog/

http://jaxzoo.org/animals/biofacts/Warthog.asp

http://bushveld.co.za/warthog.htm

http://www.greatplainszoo.org/Animals/warthog

http://www.zooatlanta.org/home/animals/mammals/warthog

http://www.staidenshomeschool.com/animals/warthog.html

http://www.rollinghillswildlife.com/animals/w/warthog/index.html

http://www.seaworld.org/animal-info/animal-bytes/animalia/eumetazoa/coelomates/deuterostomes/chordata/craniata/mammalia/artiodactyla/warthog.htm

http://www.phoenixzoo.org/learn/animals/animal_detail.aspx?FACT_SHEET_ID=100037

http://animal.discovery.com/mammals/warthog/

http://www.mbgnet.net/sets/grasslnd/animals/warthog.htm

http://en.wikipedia.org/wiki/Warthog

http://www.junglephotos.com/africa/afanimals/mammals/warthognathist.shtml

http://www.sheppardsoftware.com/content/animals/animals/mammals/warthog.htm

http://animals.howstuffworks.com/mammals/warthog-warts.htm