Crabs have round bodies. Their abdomen is small and tucked under their body. The crabs’ exoskeleton is very hard, to protect them from their many predators. Their front legs have pincers that are used for hunting, feeding, cleaning, mating and protection. The back legs of swimmer crabs are paddles used for swimming.
Swimmer crabs are fast predators. They usually live on a sandy or soft sea floor. Their skeletons are often washed onto beaches and into rockpools.