en.wikipedia.org
en.wikipedia.org
britannica.com
allaboutbirds.org
All About Birds
https://www.allaboutbirds.org › news
audubon.org
allaboutbirds.org
All About Birds
https://www.allaboutbirds.org › guide › search
birds.cornell.edu
Cornell Lab of Ornithology
https://www.birds.cornell.edu › home › all-about-birds
en.wikipedia.org
sciencenotes.org
Science Notes and Projects
https://sciencenotes.org › birds-or-class-aves-description-and-characteristics
birds.cornell.edu
Cornell Lab of Ornithology
https://www.birds.cornell.edu › home
animalfact.com
animalfact.com
https://animalfact.com › bird
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