* [http://animaldiversity.ummz.umich.edu/ Animal Diversity Web] – Database hewan milik [[University of Michigan]]'s database of animals, showingmenunjukkan [[taxonomic classification]]taksonomi, imagesgambar, anddan otherinformasi informationlainnya.
* [http://www.arkive.org/ ARKive] – database multimedia databasedari ofspesies worldwideterancam endangeredpunah/protecteddilindungi dari seluruh dunia dan speciesspesies andyang commonumum speciesdi ofBritania UKRaya.
* [http://logic-law.com/index.php?title=Kingdom_Animalia/Metazoa The Animal Kingdom]
* [http://www.scientificamerican.com/article.cfm?id=getting-a-leg-up-on-land Scientific American Magazine (December 2005 Issue) – Getting a Leg Up on Land] About the evolution of four-limbed animals from fish.
