All About Birds | Online bird guide from the Cornell Lab of Ornithology. |
AmphibiaWeb | Online database with information on amphibian natural history, taxonomy and more. |
Animal Diversity Web | Online database of animal natural history, distribution, classification, and conservation biology at the University of Michigan. |
Mammals Database | Smithsonian National Museum of Natural History's database of mammal specimens. |
Species 2000 | Index to the world's known species. |
Tree of Life Web Project | The Tree of Life Web Project (ToL) provides information about biodiversity, the characteristics of different groups of organisms, and their evolutionary history |
USDA Plants Database | Database providing standardized information about the vascular plants, mosses, liverworts, hornworts, and lichens of the U.S. and its territories. |