It's pulling its feathers out. I think he needs a friend. Deciding to get a companion for your bird is a difficult thing to do. This will inevitably lead to some degree of what can only be called the loss of pet quality. Once a bird has bonded with a bird mate, its attachment to humans has to decrease somewhat.
Many people find the bird's new behavior difficult to handle.
The closeness they once felt with their pet is now absent. Even worse is the frequent outcome where the birds don't get along at all and the owner simply finds himself with the problem compounded. Of course there are solutions. Keeping birds of different species who can provide company if not companionship for one another is a good idea. Birds can also get along with other animals, and if approached creatively, keeping a single pet bird can be quite gratifying for the owner, and a happy situation for the bird.