Eye pinning, also known as eye flashing[1] 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.[2] It is a common behavior in amazons, macaws, Poicephalus species and the African grey parrots.[3]
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.[4] Male budgerigars will perform eye pinning as part of their courtship behavior, pinning the eyes while singing, fluffing and head bobbing,[5] while amazon parrots may pin their eyes to show excitement during play, alongside a fanned tail and raised head and neck feathers.[6]
In the Panama amazon, eye pinning has been noted during vocal communication with humans. The parrot's eyes were observed to noticeably contract when talking or mimicking other sounds of human origin, video recordings indicating that the pupils began contracting several milliseconds prior to the utterance, perhaps suggesting some sort of 'internal rehearsal' process. This was not seen to be the case in the experiment with innate parrot sounds such as short squawks, neither was this behavior observed in a non-talking blue-fronted amazon. In certain circumstances, eye pinning would also occur when the bird heard specific favored words or sounds from humans.[7]
This behavior has also been observed in domestic chickens and woodpigeons.[8][9]
^Kalhagen, Alyson. "What Is Bird Eye Pinning?". The Spruce Pets. Retrieved 27 December 2020.
^"Bird Body Language: How To Understand What Your Parrot Is Trying To Say". PetCoach. Retrieved 27 December 2020.
^"Primping & Preening". Lafeber Company. Retrieved 27 December 2020.
^Schwartz, Dorothy. "Understanding your parrots body language". Exotic Direct. Retrieved 27 December 2020.
^"Budgie Courtship and Breeding Behaviour". Omlet. Retrieved 27 December 2020.
^"Amazon Parrot Personality, Food & Care & Pet Birds by Lafeber Co". Lafeber Company. Retrieved 27 December 2020.
^Gregory, Richard; Collins, Prue (20 December 1974). "Pupils of a talking parrot". Nature. 252 (20 December 1974): 637–638. doi:10.1038/252637a0. PMID 4474601. S2CID 4188563. Retrieved 28 December 2020.
^"Eye pinning: The secret way your chicken says, "I love you"". The Featherbrain. Retrieved 27 June 2022.
^Khil, Leander. ""Eye flashing" in a displaying Woodpigeon". Retrieved 27 June 2022.
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