Crabs

Crabs are Crustaceans. Crustaceans don't have backbones and wear their skeletons on the outside. This group includes 52000 species - lobsters (which are bugs), barnacles and crabs. They live on land and in the water. But most - in the water. Once I ate a crab and found cartilage inside the claw. 

Some crabs put sea anemones on their backs to protect themselves from octopuses. Some anemones eat crabs, like this one in the picture from National Geographic.


This is a Ghost Crab. They have this name because they can appear and disappear very fast - jumping in and out of their sandholes.