Maybe what you saw was the tracheal opening. Remember that during swallowing the trachea is and can be extended outwards and underneath the prey item. You can open the mouth using a qtip. The plastic middle part of the qtip. Don't use wooden qtips. Carefully use the middle plastic part to pull the lower jaw down to open the mouth. I wouldn't do it until after he digests his meal and he is relaxed. Good luck and be careful with the poor guy.![]()