Thanks for the response! He is a blue iguana and I think he is about 2 1/2. I have been using the towel trick with him and then when he is hand/ arm and he is still attempting to bite, I will let him bite the towel to get his aggression out while I am holding him. I was hoping he would use his toy but I guess he isn't into it. He has calmed down a lot today and I am hoping to take him out sometime this week to do a deep cleaning in his cage. It is hard to keep it completely clean when he is so aggressive. How do you clean your cages during these aggressive times?