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This Sea Urchin Carrying Crab - Dorippe frascone has a symbiotic relationship with a long-spined sea urchin and carries one around on its carapace by using 2 of its legs. The Crab uses the Sea Urchin as protection and the Sea Urchin benefits from the crab by getting some of its food from the food that the Crab eats as the Crabs are messy eaters. It is always fun seeing the Crab moving around carrying the Sea Urchin. Usually during day time, the crab is buried in the sand.