Verbs of one bird or one platoon of birds do not necessarily coincide in meaning with the same movement in all other birds. It was found that there are general similarities in the verbs and their meanings Pupil's eyes dilated The brightness or expansion of the pupil can be a sign of aggression, enthusiasm, tension, or enjoyment. Pay close attention to other behaviors associated with this to do to verify the cause behind it. A bird that exhibits another aggressive behavior or act such as the tail brushes, as this action comes with the meaning "get away!" And if you keep trying to communicate, then you may get a painful bite because of what you did, your bird may also show this act in response to another bird, animal or an unwanted person around.