An electronic encyclopedia providing information on the natural history, health, and management of captive and free-ranging wild animals.

The most comprehensive and current reference work detailing the life histories of North American birds.

This comprehensive encyclopedia of animal life is arranged taxonomically by class, order, and family. It covers evolution, distribution, habitat, behavior, feeding ecology, reproductive biology and significance to humans, and includes photos, drawings, and species distribution maps.

Click on "Biological Sciences" to search several dictionaries and encyclopedias.