I know some of them can, not sure if all. Another interesting thing about some (if not all) crabs is that they will have one large claw for fighting other crabs while the second claw is small, for eating. They can’t really eat with the big claw, so if they lost their small claw they’d be screwed. It seemed that at least this one type of crab I was looking at had some that had the big claw on the left hand side while others had it on the right hand side – one was more common than the other but I dont remember which.