I've had an African grey for 3 years and for the past few months it's been losing feathers constantly. It's not normal molting, it's quite a lot. The cage is in a place with natural light, I give it fruits and seeds, but it keeps happening. Could it be stress?
I had a grey parrot for years and feather loss like that can be several things - stress yeah, but also nutritional deficiencies (greys need a lot of vitamin A, calcium and omega-3, it's not just fruit), mites or even skin problems. The spot with natural light is good, but it's worth taking your bird to an avian veterinarian because constant loss like that isn't normal, even accounting for molting. In the meantime try increasing food variety - dark leafy vegetables, nuts, hard-boiled eggs - and make sure he's getting time out of the cage to move around properly, because confinement and boredom cause stress and that definitely affects the feathers.
African greys also shed feathers excessively when the air is too dry or when they get bored (lack of enrichment in the cage - toys they can take apart, wood to chew on, that kind of thing), so before you start looking for deficiencies, it's worth checking these basic details too. If the cage is small or he's alone for long stretches, pure stress could very well be the culprit.
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