Enhanced visual acuity, seeing ultraviolet light, and changing focus rapidly are some of the fascinating abilities of birds' eyes.
Pet Birds & Parrots - Care, Behavior, Food and Pet Bird Facts – Pet Birds by Lafeber Co.
How is it that raptor birds with smaller eyes have more acute vision than we humans? A healthy human eye at the pupil size for typical daytime lighting resolves one minute of arc. Optically, a smaller eye should resolve less, not more. - Quora
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The American Bird Conservancy Guide to Bird Conservation
What is the reason why some birds' eyes change colors when they move or blink? - Quora
Birds' eye size reflects habitat and diet, may predict sensitivity to environmental change – Research News
Area pets available for adoption (now with BIRD PHOTOS), Oct. 23, 2019
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