Biodiv RefQH75.S75 1995. Threatened Birds of the Americas. Duke University Press, 1990. Produced by ZCI publishing. Information was gathered from the World Wildlife Fund Guide to Endangered Species.
Information is comprehensive and usually includes a bibliography, as well as an image.
Database is appropriate for elementary grades and up. RareFind - Natural Diversity Data Base. Produced by the California Department of Fish and Game. Computerized inventory of species of special concern, endangered, threatened and rare plants, animals and natural communities in California. Information does not provide an overview, but is specific to individual citings.