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Bookmark or Share- Bird | Description, Species, Classification, Types, & FactsBird, any of the more than 10,400 living species unique in having feathers, the major characteristic that distinguishes them from other animals. They are warm-blooded vertebrates more related to reptiles than mammals. Learn more about birds in this article.
- Guide to North American Birds | AudubonAccess a free guide of more than 800 species of North American birds; Discover the impacts of climate change on birds and their habitats; Learn more about the birds you love through audio clips, stunning photography, and in-depth text
- Bird - WikipediaBirds are a group of warm-blooded vertebrates constituting the class Aves (/ ˈ eɪ v iː z /), characterised by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a strong yet lightweight skeleton.
- Search, All About Birds, Cornell Lab of OrnithologyThe Cornell Lab will send you updates about birds, birding, and opportunities to help bird conservation.
- Structure and functions of birds | BritannicaA covering of feathers distinguishes birds from all other animals. Birds have a four-chambered heart (like mammals), forelimbs modified into wings, and keen vision, and their eggs have calcium-rich eggshells. Their sense of smell is not highly developed. Birds are found almost worldwide in diverse habitats on both land and water.
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