I am puzzled, if not bewildered, by their intelligence. Not too long ago I saw a show about the puzzle solving ability of parrots. A complicated nut, bolt and wire puzzle was presented to a parrot to solve to get a treat. He not only figured it out, but when the middle of the puzzle was disabled, the bird understood that and only solved the second half of the puzzle. Incredible.
And if I remember correctly, they often really do understand what they are saying. What is your experience with that?