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Hermit Crab in a Decorative Spiral Shell

A small hermit crab explores the ocean floor beside a starfish while carrying a spiral shell on its back.

A hermit crab emerging from a spiral shell beside a starfish on a coral reef.
Hermit Crab in a Decorative Spiral Shell
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A Hermit Crab on the Coral Reef

A hermit crab moves across the sandy ocean floor next to a starfish and a spiral shell. Because these crustaceans do not grow their own hard outer casings, they rely on discarded shells to protect their soft bodies from ocean currents and predators.

Surprising Habits of Hermit Crabs

Unlike most crabs, hermit crabs are born with soft abdomens that require external protection. As they grow bigger, they must abandon their current shell and search for a larger one, often swapping homes with other crabs in organized switching chains along the sea floor.

Natural Colors of a Hermit Crab

  • Hermit crab body: Reddish-orange or brown
  • Spiral shell: Cream, beige, or tan with brown markings
  • Starfish: Bright orange, red, or muted purple
  • Sandy ocean floor: Pale yellow or light gray
Questions and answers

Questions and Answers About Hermit Crabs

How do hermit crabs find new shells when they grow?
They search the seabed for empty snail shells left behind by other sea creatures. When several crabs gather around a shell, they sometimes line up by size to trade homes in order.
Why do hermit crabs need a shell to survive?
Their abdomen lacks a hard outer exoskeleton, making it vulnerable to predators. The shell acts as a portable shelter that protects their soft body and keeps their gills moist.
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