Parrots are not counted as having nonhuman intelligence. There is some data about psittacids are among the more intelligent animal species. During the 1950, for example,some scirntists from England http://tararadam.com/England demonstrated that Grey parrots can be tought to some communicative skills .
There is a story about a doctor who had a gray parrot. Doctor has tought the parrot when someone is outside the door, to say: "Open the door and call the doctor". But the parrot often reverses the order, and shouts out: "Open the doctor and call the door". http://tararadam.com/alarmsystem_portal