Access the full text of the second edition (2004) of Grzimek's. This encyclopedia contains revised information as well as recent developments in the animal world.
International Field Guides contains a searchable database to field guides for plants, animals, and other objects in North America and around the world. It may also be browsed by by type of organism and region covered. This site was created by Diane Schmidt, Biology Librarian at the University of Illinois at Urbana-Champaign.
From the Macaulay Library of Cornell's Lab of Ornithology, the Sound and Video Catalog provides access to the world's largest natural sound and video archive of animal behavior. Although birds are favored, many other animals are covered. The site is fully searchable.