I must admit that I am at a bit of a loss for what to do at the moment. I've tried adding new toys to his play perch/play gym, keeping a bowl of food and water nearby that he can always access, and attempting to get him to chew on a small toy (like those tiny shoes, a large nut wrapped in paper, etc...) but nothing seems to keep his interest. He seems completely intent on chewing up my upper arm. I feel that this isn't allo-preening as he is taking large mouthfulls of cloth (and skin) and chewing pretty hard. I suspect preening is meant to be a wee bit more gentle...

Most worryingly is that when I do so much as turn my head to look at him while he is sitting on my arm he will pin his eyes and nip at my face. He hasn't gotten close (yet) but I really, really don't like the way this is going. Today was the first day when he attempted to bite my hand when I was trying to get him to step up off my arm (I was trying the firm but gentle "No" and moving him off me). If I attempt to hand him a toy to chew on rather than me he immediately threatens to bite the hand holding the toy.
The only thing I can think of off the top of my head is to provide him with toys that are more interesting than my shirt/flesh. Does anyone have any recommendations for good foraging toys? I feel like that might help give him something more to do and maybe burn off some of his energy. (I've been trying to help him exercise so his wing muscles, etc., are strong enough for him to fly safely once his flight feathers have grown back).