I agree with Carol. While it may be amusing to us, it is stressful for Albert. He has no way to escape this intruder so he tries to fight or be dominate over it. He probably thinks it is another chameleon with a red head and yellow horn. If he does not accept it within a few minutes take it out. Captivity stresses them enough without adding to it. You should Google "capture myopathy". I did not know about it before I saw this article but it has made me think twice about how I handle my chameleons.