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This Dire whelk shell was about 4 cm long, gray and smoothed by the sea. Now has been caught by the spines of a Purple sea urchin and has become the center piece of its decoration. Scientists think this behavior protects urchins from drying out, getting eaten by gulls or being damaged by the sun's ultraviolet rays.
Spotted in a tide pool at Tongue Point Marine Sanctuary.
This whelk is found in shallow waters in the northeastern Pacific Ocean.