He is showing cage aggression. I will try to get him out without forcing him and he doesn't want to so I have tried to get him use to me by just petting him in the cage or sitting in front of it for him to get use to me. when I take my hand out of the cage and he opens his mouth to me every time I have done this. My dad seems to think it might be because he was not handled a lot and when the pet shop feed him it was in the cage and could have been the only time the lid was open. The one time I have been able to get him out of the cage he wasn't that aggressive but was very curious and was checking things out while trying to get away from me.