try getting a large plant, open the cage door, set the plant in front of the door and see if he will venture out onto the plant. It is possible you may be able to approach him more easily out of the cage than in. You can always use a glove if you are afraid he is going to bite. Do not approach from behind or over his back. Let him see your hand in front of him. Try to slide your hand slowly under his chin and lift up to try and get him to climb on. He may puff up but that is ok. Just keep trying even though he is mad!