Hello Avenue! I wanted to share this information because I know there are many out there dealing with feather destructive behavior in their birds. This is not a veterinary solution, this is merely a home remedy to help break the pattern of feather destructive behavior that I personally found effective with my bird. Get some yellow mustard, and put 2 or 3 squirts into a spray bottle, and add water. Shake it up and mix it well, and spray your bird with it. The bitterness of the mustard repels them from wanting to break their feathers. Recently Zloto began barbering his feathers (he snips them in half or in pieces with his beak). It began suddenly. One day he was fine, the next we noticed a pile of 20-something broken feathers on the bottom of his cage, and witnessed him do it several times. In a panic, I emailed the staff of Golden Cockatoo (where I got him), asking for advice. They told me to try this, and it really did work. He has stopped barbering his feathers completely! He has a vet appointment on Tuesday. In the mean time, he has stopped destroying his beautiful plumage while smelling like a hotdog I hope this helps some people!