- Ocean Wanderers
 - Riding the wave with other pelagic enthusiasts. - North American Birds Photo Gallery
- Containing images by Peter LaTourrette of numerous North American bird species.
- John James Audubon's Birds of America
- Online version of Audubon's complete 1840 seven volume text with his illustrations and original text descriptions.
- Introduction to the Aves
- Contains information on the fossil record, life history, ecology, systematics, and morphology.
- Obsolete English Names of North American Birds
- Guide to bird names that have been supplanted by modern equivalents.
- Birds of Prey
- Information and photographs of birds of prey that can be found in North America.
 Birds of Kolkata
- Galleries of photographs by Sumit K. Sen, Ron Saldino, Sujan Chatterjee, and Dipankar Ghose featuring birds and mammals of India.- Birds of Kerala
- Includes information on bird species, habitats, and birding in Kerala, India.
- India Birds
- Profiles the birds of India with photographs and bird calls.
- Birds of Oklahoma
- Features images of both native and migratory Oklahoma birds.
- Aviary
- With photos and information on a number of bird species, from common to exotic.
- Eggs - A Virtual Exhibition
- Devoted to oology, the exhibit showcases eggs of the world with a special emphasis on the eggs of Alberta.
- U.S. Fish and Wildlife Service: Birds, Birds, Birds
- Protects and enhances the populations and habitat of more than 800 species of birds that spend all or part of their lives in the United States. Includes laws, educational materials, migration management, and recreational information.
- Zoonomen: Zoological Nomenclature Resource
- Contains an extensive list of valid scientific avian names.
- Birds of Kathiawar, The
- Informational website on rare and endangered birds of India.
- All About Birds
- General information source about birds. Includes fun facts, bird jokes, common questions, and other resources.
- Softbills.com
- Provides information on a wide range of small, flying birds that live on soft foods like fruit, nectar, or insects.
- Familiar Birds
- Features Arthur Cleveland Bent's Life Histories of North American Birds, a twenty-one volume series published between 1919-1968 providing behavioural information not available in the standard field guides.
- Birdhouse Network, The
- A spring and summer birdhouse-monitoring project organised by the Cornell Lab of Orinthology. Includes details on building and monitoring a birdhouse, news, live cams, and more.
- Birds123.com
- Introduction to attracting birds to one's home, birding and bird watching, photographing birds, and taking care of exotic pet birds.
- BirdHouses 101
- Guide to birdhouses, including what kinds of materials to use, maintenance, attracting birds to nest, setting up birdhouses, and more. Also offers information on different North American bird species.
- 50states.com: Official State Birds
- Profiles listed by state and by family.
- Bird On!
- News, facts and pictures of wild birds, including verbatim press releases.
- Multilingual Birdsearch Engine
- Provides translations of bird names in 18 languages.
- About.com: U.S. State and Canadian Province Birds
- Sorted by state or province as well as by species of bird.
- Amazing World of Birds
- Offers interesting bird facts and information about their migration, anatomy, identification, and classification.
- Cornell Lab of Ornithology Home Study Course in Bird Biology
- Introductory college level course that teaches students about bird behaviour, ecology, conservation, and related topics.
- Birds of Kauai
- Features Hawaii's famous native forest and wetland birds.
- BirdSleuth
- Cornell Lab of Ornithology's BirdSleuth curriculum is designed to give students experience with the entire scientific process: observing birds carefully, collecting data, asking their own questions, drawing conclusions through research and observation, and publishing their results.
- Visual Resources for Ornithology (VIREO)
- Comprehensive collection of bird photographs from the Acadamy of Natural Sciences.
- BBC: Birds
- Includes articles, bird sounds, wild facts, and birdcam as well as conservation tips and things you can do to encourage birds to visit your garden.
- BirdFacts
- Profiles of common and rare birds in the United Kingdom.
- List of State Birds
- With Audubon illustrations.
- NATURE: Extraordinary Birds
- Reveals some of the astonishing abilities that birds possess.
- Ornithology and the Genesis of the Synthetic Theory of Evolution
(PDF) - Report discussing in which respect ornithologists were especially prepared to appreciate the new genetical theory of evolution.
- Avian Visual Cognition
- Online text providing a survey of one area of modern comparative research, edited and published by Dr. Robert G. Cook.
- Birds: A Virtual Exhibition
- Provides an insight into the wealth of knowledge in Canadian museums about the world of birds.
- Birds Down Under
- Includes Australian bird, environment, and cultural information.
- Birds of Nebraska
- Features over 1000 articles from newspapers and other sources written between 1854 and 1923 on the subject of birds in Nebraska.
- Evolution of the Aves
- Information on the fossil record in the evolution of birds and theories about the origin of flight.
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