many species annually migrate great distances
communicating with visual signals
calls
and songs
and participating in such social behaviours as
i love bird.
@rahul9004 (1)
Jaipur, India
July 10, 2015 1:02am CST
Birds (class Aves) are a group of endothermic vertebrates, 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.
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