Crabs have adapted to live in a number of different environments Legs Short legs can tuck under the body to avoid predators. Long legs run quickly over rocky ground Paddles on the back legs enable swimming Spikes give good camouflage Carapace Spikes makes the crab hard to eat Flat carapaces can squeeze under rocks Bumpy carapaces provide good camouflage Claws Fat pincers open shelled creatures pointy pincers catch fish One giant claw makes males look scary Colour and Pattern Bright colours attract mates and scare off predators Dull colours help with camouflage