Ah, you learn something new everyday. Guess I won't ever be getting lobsters. Climbing is a definite no for me.I use them. The t's love them. They do climb but if you put about an inch of Vaseline around the top of the tub you keep them in they can't climb over it however I keep them with egg cartons that they can hide under and I NEVER see them climbing unless I'm messing around trying to grab one. I've had no problems so far and no escapes.