Birds are a group of warm-blooded vertebrates constituting the class Aves, 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. Wikipedia
Scientific name: Aves
Class: Aves; Linnaeus, 1758
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Lower classifications
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Birds are a group of warm-blooded vertebrates constituting the class Aves characterised by feathers, toothless beaked jaws, the laying of hard-shelled eggs, ...
Feathers are not the only thing that defines an animal as a bird, they also have wings, lay eggs, build nests and have specialized beaks and feet. FEATHERS!
Explore more than 800 North American bird species, learn about their lives and habitats, and how climate change is impacting their ability to survive.