Sleepy Sponge Crab at Black Rock ::: << Prev ::: Thumbs ::: Next >> :::  
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2 of 6. Sleepy Sponge Crab are considered the most evolutionarily primitive of the true crabs and are often found hiding by the day in caves and crawling along the reef at night. The Sleeping Sponge Crab can easily be identified by the bone-white claws.