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Birds (Aves)

Birds - the feathered variety. Birds (class Aves) are bipedal, endothermic (warm-blooded), vertebrate animals that lay eggs. Birds (class Aves) are bipedal, endothermic (warm-blooded), vertebrate animals that lay eggs.

Birds are characterised by feathers, a beak with no teeth, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a lightweight but strong skeleton. All birds have forelimbs modified as wings and most can fly, with some exceptions like penguins, ostriches.

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