Ghost crabs live high up on the sandy beach. They live in burrows, and the square body is coloured like sand. They run extremely fast on the tips of their legs, casting a shadow of their body on the sand. All of a sudden they stop, and lower their body so that the shadow disappears. The colour of the body matches the dry sand, and it looks as if the crab has just disappeared and melted in the sand; hence the name ‘ghost crab’.