Crab on the Sandy Seafloor
A friendly crab stands facing forward on sandy ocean ground with its claws raised high.
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Crab Standing on Sandy Seafloor
A friendly crab positions itself on a soft bed of sand, viewed directly from the front. Its claw arms point upward while its eyes extend outward on short stalks above its body shell.
Facts About Crab Shells and Locomotion
Crabs move sideways because their leg joints bend outward rather than flexing forward like mammalian limbs. They possess a hard outer exoskeleton made of chitin that shields their internal organs from marine predators. As crabs grow bigger, they shed their old shell in a process known as molting to form a soft replacement shell underneath.
Natural Colors of Shore Crabs
- Crab carapace shell: reddish orange, dark brown, or olive green
- Crab claws and legs: bright red, orange, or yellowish brown
- Eyestalks and eyes: black or deep charcoal
- Ocean seafloor sand: pale beige, tan, or light yellow