Once when I visiting a friend I heard someone saying hello, hello outside the window. I looked out and couldn't see anyone. Then I saw this crow standing there

Once when I visiting a friend I heard someone saying hello, hello outside the window. I looked out and couldn't see anyone. Then I saw this crow standing there and it said hello again. Turns out one of my friends neighbors used to feed the crows and taught one of them to say hello like a parrot.