Hello, I am new. I have a Nanday, Bruno, and a larger Mitered, Caesar. Both are picked clean of feathers on their bellies and legs, but Bruno has a history of self-mutilating, and four operations to fix him. He wears a collar. This morning I noticed that Caesar has been biting him badly (or pruning aggressively), so that Bruno now has tiny scabs all over his belly and legs. Help!!