Crabs have several methods for protecting themselves from predators. Some species, like the decorator crabs, can camouflage themselves by attaching bits of seaweed and other materials to their exoskeleton. Other species have hard exoskeletons, which provide physical protection from predators. Some crabs also have sharp claws or spines that they can use to defend themselves, while others will simply retreat into their burrows or hide in crevices to avoid danger.