A remarkable case of avian vocal learning concerned a talking African grey parrot called Alex.
Some birds elaborate their songs with sounds from other bird species.
Deprived of the opportunity to copy their natural vocabulary, captive birds of certain species will copy not only human speech, but almost any other sounds, including music.
Which birds drum, hum, snap, bleat and clap? And why?
It's the most musical of all nature's sounds, but why do birds sing?
What are bird calls and how do they differ from birdsong?
How do birds learn, produce and experience such complex sounds?
Some birds are excellent mimics, but can they really talk to us?
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