I don't know if this qualifies as a 'special' ability... I had a parrot once who could copy the telephone ring exactly. Sometimes we would rush to the telephone, realizing moments later that it was him. It's about what you teach the bird. read more
Still, parrots do not imitate the voice of other birds in the wild, that's why their imitating ability remains an enigma for the researchers. In this case, the best imitator of the voice of other birds is the mockingbird (Mimus polyglottos), an American native. read more