The Mammal Species of the World - A database of mammalian taxonomy containing the names over 4,000 currently recognized mammal species. This databases intended for use as a "convenient on-line reference for identifying or verifying recognized scientific names and for taxonomic research." The database may be searched using a number of different fields, including scientific and common names, original publication citation, type species or locality, distribution, etc.
Endangered Species - From the US Fish and Wildlife Service, a page for kids interested in endangered and threatened wildlife.
National Wildlife Federation Kid's Page - Ranger Rick's Zone!
Nebraska Waterhole Ten Million Years Ago - Historical look at Nebraska 10 million years ago sponsored by UN State Museum.
Animal Planet - The Discovery Channel has some great stories and pictures of Animals. This site has games, webcams, and animals by subject. Site can be slow due to heavy use.
Smithsonian National Zooological Park - The study of and preservation of the diversity of animals and their habitats.