"Parrots are born to fly. It's not just their feathered appearance that is evolved for flight. Their entire cardio-respiratory system is like a turbocharged engine that is dying for flight. Their brain is capable of processing its spatial surroundings, navigating, planning, and thinking at the speed of flight! Without flight, the muscles and the brain decay from disuse. We need that brain to stay sharp to learn to be the great pet that we desire. Eliminating flight eliminates the intelligence that we need to tap into to teach the parrot to cooperate "