The Genius of Birds

All birds vocalize. They hoot, yodel, caw, wail, rattle, chit, seet, and sing like angels. They call to warn of predators and to identify family, friends, and foes. They sing to defend their territory—to stake it out or fence it in—and to woo a mate. But singing is something special. An excerpt from Jennifer Ackerman’s book, "Genius of Birds."
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