Audubon - Mission is to conserve and restore natural ecosystems, focusing on birds, other wildlife, and their haabitats for the benefit of humanity and the earth's biological diversity. Site includes Citizen Science projects.

BirdLIfe International - An international nature conservation partnership.

BIRDNET - From the Ornithological Council (American Ornithologists' Union, Association of Field Ornithologists, CIPAMEX, Cooper Ornithological Society, North American Crane Working Group, Neotropical Ornithological Society, Pacific Seabird Group, Raptor Research Foundation, Society of Cnadian Ornithologists, Society for the Conservation and Study of Caribbean Birds, The Waterbird Society, Wilson Ornithological Society

British Ornithologists' Union - Site includes British List, official list of wild birds' records in Great Britain, book reviews online from recent issues of IBIS and lists of other books received.

International Ornithologists' Union - Information on the International Ornithological Congress, includes last several International Ornithological Congress proceedings.

North American Bird Banding Program - From USGS.

Ornithological Societies of North America - Member societies: American Ornithologists' Union, Association of Field Ornithologists, Cooper Ornithological Society, Raptor Research Foundation, Waterbird Society, Wilson Ornithological Society. Site includes ornithological jobs and latest issues of member publications.

American Ornithologists' Unon - Mission is to advance the scientific understanding of birds, to enrich ornithology as a profession, and to promote a rigorous scientific basis for the conservation of birds. Publish: The Auk, Ornithological Monographs, Series in Ornithology, Birds of North America, and Special Publications.