Animal Diversity Web (ADW) is an online encyclopedia of animal natural history, distribution, classification, and conservation biology created by the University of Michigan. Animal Diversity Web has thousands of species accounts about individual animal species. These may include text, pictures of living animals, photographs and movies of specimens, and recordings of sounds. Species accounts provide information on species habitats, behavior, physical description, geographical range, and other information. Students write the text of these accounts, but they are reviewed and edited by ADW staff and instructors before they are posted in the database. Animal Diversity Web also has descriptions of levels of organization above the species level, especially phyla, classes, and in some cases, orders and families. Hundreds of hyperlinked pages and images illustrate the traits and general biology of these groups.