Crab amputates own limb
Janill Gilbert stashed this in Animals
Does it hurt the crab to lose a limb?
I'm guessing they don't feel a thing ;)
There is a debate as to whether invertebrates feel pain:
Per this info, it seems like they do, but maybe it's a case of less pain to get rid of the broken claw and/or even if it is more pain, the claw is useless/sub par, and you would rather grow a new/good one.
Wait, crabs can grow new claws?! Cool!
Yep, that's why it works for them to toss a bad one, not an option for us :(