Each crab species has its own features, but primary defense mechanisms for most include their hard shells and pincers. Their shells protect them against predators and rough elements. Crabs have tight grips with their pincers, which allows them to grab hold of predators and fend them off.
Crabs also use cunning to protect themselves. Their ability to condense their bodes enables crabs to take cover under rocks and other objects to hide from predators. Some use seaweed and other plant life to cover themselves. Certain species of crabs even have coloring that blends in with water plants, which provides a natural camouflage.