The neurobiologist Erich Jarvis studies the few species capable of speech. He has long hoped to genetically engineer an animal that can make new calls. Imagine a chicken that could speak or a pigeon with a voice rivaling that of the most musical songbirds. Granted, the world probably doesn’t need any gossiping chickens or pigeons breaking out in song. But why some birds learn to create a deep repert... [712 chars]
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