Feathers are often the first thing we notice about birds. The state of their feathers can tell you a lot about the health and well-being of your bird. Although some feathers do fall out in the natural course of molting, a bird who continually pulls them out may be sending you a signal that something is wrong.
Causes
Birds that are stressed will pluck as a means of pacifying themselves, and sometimes do it out of boredom or lack of interaction. There can be medical causes