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.

The encyclopedia contains more than 370 articles that will provide a detailed and synthetic overview of theory and research in evolutionary biology and will chart the intellectual history of the field.

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