Hermit Crab

Hermit crab (Lakshmi Sawitri / CC BY)

Hermit crabs carry around empty seashells, which give them shelter. Growing crabs must change their shells on a regular basis. The size of hermit crabs ranges from a few millimeters to 10–20 centimeters (3.9–7.8 inches, Coenobita brevimanus).

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This supplemental online resource accompanies the book Scuba Diving Hand Signals by Lars Behnke, available on Amazon.