A man lives in a very tall building. He has a lot of money and he has a parrot at home. It's a clever bird. Every morning, after the man gets up, the bird says "hello". When the man comes back from his work, the bird says, "Is that you? Come here. I can see you." One evening, when the man is sleeping, a thief comes into his building by climbing up the window. When he finds some money and begins to leave the house by climbing down through the window again, he hears a voice in the dark. "Hello! Is that you? Come here. I can see you." The thief is so frightened that he falls down from the window. . A parrot is kind of   _
thing bird man machine