warm-blooded vertebrate of the class Aves, unique in having feathers, the one major characteristic that distinguishes them from all other animals. Birds have a four-chambered heart (shared with all mammals), forelimbs modified into wings (shared with bats), a calcareous-shelled egg, and keen vision, the major sense they rely on for information about the environment. Their sense of smell is not highly developed, and auditory range is limited. Most birds are diurnal in habit.

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