I have an umbrella Cockatoo, would blow your mind with how intelligent and "manipulative" he is. They are serious problem solvers, he stacks toys, puts rings on/off of a peg, opens latches, unties knots, disassembles ball point pins piece by piece with no damage, and he has quite the vocabulary and says certain things at very appropriate times. Birds are amazing creatures, I have always been enamored by them.