Eye pinning
Eye pinning, also known as eye flashing or eye blazing, is a form of body language used by parrots. The term that refers to the rapid and very conspicuous dilation and constriction of the pupils of the bird's eyes in response to an external stimulus. Unlike humans, parrots are able to control this reflex and use it as a form of nonverbal communication. It is a common behavior in amazons, macaws, Poicephalus species and the African grey parrots.It can be an indication that the parrot is feeling excited, angry, afraid or is interested in something. In some circumstances, it may also be a warning that the parrot is currently in a state of being where it will bite if touched.