by Wolf » Sun Jan 10, 2016 2:30 pm
I don't have GCC's but the screaming may be due to his wanting attention from you and the biting appears to be due to his not trusting you yet. That is the short answer and really does little to help you to understand your bird or how to remedy the situation that you find yourself with.
Like all other parrots, GCC's bite and they chew things, the chewing things is what they do in the wild in order to find food and it is how they develop their nest site from being just a hole in a tree to their own nesting area that is safe enough to raise their young in. In the wild the biting is a last ditch effort to protect themselves, their nest area and their offspring. But it takes on some different connotations when in captivity such as trying to prevent things being done to them while they are scared or that they don't want done to them. Biting can also be a way of disciplining us for not giving them enough attention or to attempt to prevent us from giving our attention to any other bird or animal or human that they perceive as a rival for our attention and affection. They get jealous of us.
You have only had your bird for a month and it has indeed made a lot of progress and doe's want to be with you and is trying to spend time with and on you but needs to trust you and that is what you need to spend time with. Talk to and praise your bird, using his name, use a higher pitched tone like you would with a young child. While you are talking with him, offer him a treat, maybe a couple of bites of sprig type millet every now and then. Wait for him to come to you for the treat when you offer it and if you offer it and he doesn't take it, leave it for him. If he is excited, wait for him to calm down before interacting with him other than talking to him. If he is on you and starts getting excited try to distract him with a treat or a favorite toy to keep him from biting you. If he bites you put him down on the closest safe surface while telling hi " No Bite" or something of that nature and ignore him for a few minutes. Make sure that you use the same phrase each time so that he learns what it means. The best way to stop the biting is to not get bitten in the first place, so learn his body language to help you to avoid getting bitten. But the main thing is just to spend a lot of time talking and singing to him and sharing safe foods with him so that he can learn to trust you.