Couldn't believe that my parrot did this at the vet's office, so had to share. My African Grey (Brutus) that I adopted from an avian vet ten years ago was missing some feathers by his beak, so I decided to take him to a bird vet. He was sitting on a perch in a plastic clear carrier cage in one of the examining rooms and when the vet walked in, he said "What kind of bird are you?" I swear!!! Then, when she put him on the electronic scale, he tells her "up" and after she put him back in his cage, he says "bye bye". Then when the examination was complete, he starts whistling as if he knows he passed his inspection!!!!
Anyways, I later learned that the missing feathers are from scratching himself on his food dish. When in his carrier cage, he picks up his food dish, dumps out the food, and stares at his reflection in the metal dish!!! Apparently, he sometimes scratches himself on the side of the dish when holding it. The price of vanity!!!!