My Tona is a voracious eating machine, I know he eats 3 locusts exactly, when I offer more, he bites down but releases again. Headbutting looks funny, it's the pacman thrusting forward with it's head. It looks like an attack on prey but with a closed mouth. How many crickets do you offer normally? If he still eats after you've allready fed him on the same night, I think you need to drop a few more!