The Cornell Lab of Ornithology
www.allaboutbirds.org/guide/search
This website features an online Bird Guide that is searchable by name and shape or taxonomy. It also offers basic instructions for those interested in birding, as well as a multimedia library of articles, photos, videos and sound clips of birds.
The U.S. Fish & Wildlife Service Migratory Bird Program
https://www.fws.gov/birds/management/managed-species/migratory-bird-treaty-act-protected-species.php
This website features both alphabetical and taxonomic lists of birds protected by the Migratory Bird Treaty Act (MBTA). It also includes information on avian health and disease, Bald and Golden Eagles, bird management, bird hazards, hunting, laws, regulations and policies, permits and FAQs.