Why Do Crabs Have 10 Legs?

The left claw is used for defense, as well as for climbing and other heavy-duty tasks like protecting the crab while inside the shell. The smaller right claw is used primarily for eating. The next two pair of legs are walking legs and are thinner than the chelipeds.

Why do some crabs have 8 legs?

The front two legs have claws, known as pincers. The other eight legs are used for walking.

Do all crabs have 10 limbs?

Crabs are all contributors to the order Decapoda; this literally means these sea animals with thick shells have got ten feet. Almost all crabs have 10 legs except a few select subcategories. Horseshoe crabs, which come under the phylum Chelicerata, have eight legs and are intently associated with spiders.