CD is right, some dander and feathers are normal. Didn't you know that greys have a dust about them, not as bad as some cockatoos do, but it is there. Also when they go thru a molt you will see lots of feathers and that is nothing to worry about either. Now like CD said if you see a lot of feathers and the ends are chewed like and you see bald places on them then you can worry about it. Hope I have helped.