Fun facts about the Crab
Crabs are known to walk sideways because of the way their leg joints are arranged, though some species can move in any direction. They have compound eyes on stalks that they can retract for protection. The coconut crab, the world's largest land invertebrate, can climb coconut trees and crack open the nuts with its powerful claws. Crabs communicate by drumming and waving their claws in species-specific patterns.