Why did my crab lose its big claw?

* Injury: Crabs can lose claws due to injury, such as being caught in a trap or attacked by a predator. If a crab loses a claw due to injury, it will typically grow back over time.

* Moulting: Crabs moult, or shed their exoskeletons, as they grow. When a crab moults, it may also lose its claws. However, the claws will typically grow back within a few weeks.

* Autotomy: Some crabs have the ability to autotomise, or detach, their limbs when threatened. This can help them to escape from predators. If a crab autotomises a claw, it will typically not grow back.

If you have a crab that has lost a claw, there is no need to be alarmed. As long as the crab is otherwise healthy, it should be able to live a full and happy life without a big claw.