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Minor Cause
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African grey parrots continually molt, according to the Association of Avian Veterinarians Annual Conference. But they should not have large patches of completely bald skin. This is a sign of feather plucking.
Major Causes
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African grey parrots can pull their own feathers out when stressed, bored, sick, exposed to lead or zinc poisoning, or have minor injuries. Check for other signs of illness such as a peeling beak, blood on the feathers or sudden grogginess.
Expert Advice
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African greys can bite when they are molting, according to "African Grey Parrots: A Complete Owner's Manual." They will not want to be touched at this time, especially when their pin feathers are growing back in. Keeping the skin moist with a mist spray bath can help ease itching.
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Loss of Feathers in African Greys
African grey parrots (Psittacus erithacus) will eventually lose their feathers during molting. But a parrot with constant bald spots or a parrot that pulls out its own feathers every day could be sick or is suffering from a behavior problem.