So I am having some issue with my GCC. He seems to be suffering RBS and is trying to have his way with everything. Tried redirecting but that just causes pretty extreme aggression. If he is put back in his cage he shrieks and carries on. Never been the friendliest bird always had issues with aggressive biting which we have been working on without much success. Any tips or suggestions would be much appreciated. I don't really want to have to relegate him to an aviary when he was a hand reared bird.