When it comes to the senses — sight, smell, sound and taste — vision is extremely important in how birds (parrots or otherwise) decide what to eat. Unlike people, many bird species have structures within their retinas that enable them to see ultraviolet (UV) light, making the colors that they see look very different from those that we see. In fact, the way that UV light reflects off the waxy outer layers of fruit helps birds determine whether fruit is ripe to eat. Given the importance of color in food selection by birds, when you choose snacks for your pet bird, consider the colors of the rainbow.
Laurie Hess, DVM, Diplomate ABVP (Avian Practice)
Veterinary Center for Birds & Exotics