We have a 17 year old aftican gray parrot he completely plucks his feathers out. My grandparents gave him to use a few months ago and they were heavy smokers which might be the cause.
He also does not get to go outside or walk around the house because he is so mean. he will crawl along the floor since he cant fly and bite our feet. And he bites very hard. He has a good sized cage and he gets to walk on top of the cage we leave the door open. He wont let us pet or hold him either.
Same with my grandma only my grandpa was able to handle him. He is very nice to my grandpa and even will leave his cage to climb on my grandpa while he is sleeping.
Any help :/