Crabs

Crabs are crustaceans found in oceans, fresh water, and even on land. They have hard shells called exoskeletons that protect their soft bodies. Crabs have 10 legs, and the front two are usually big claws called pincers. They are famous for walking sideways.

Why Sideways?

Crabs walk sideways because of the way their legs bend. Their legs are attached to the sides of their body and move best in a side-to-side motion. This actually helps them move quickly and squeeze into tight spaces between rocks and coral.

Growing Up

As crabs grow, they must shed their old shell and grow a new, bigger one. This process is called molting. Right after molting, the crab is soft and vulnerable until the new shell hardens. Some crabs, like hermit crabs, use empty snail shells for protection.

Fun Facts

• There are over 6,700 species of crabs.
• The Japanese spider crab can have a leg span of 12 feet.
• Hermit crabs switch to bigger shells as they grow.

Did You Know?

Christmas Island in Australia has a famous crab migration where millions of red crabs walk from the forest to the sea to lay their eggs every year!