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Coconut crabs spend most of their lives on land, but they start out in the ocean. On the new moon, a female coconut crab larvae (which she's been carrying around in her abdomen since they were just fertilized eggs) into the ocean, and the babies around in the currents for a month or so before dropping to the seafloor and finding nice, cozy snail shells to move into. Just like your childhood hermit crab friend, young coconut crabs move in and out of shells as they up and get used to living on land. Sometimes a juvenile coconut crab will use a coconut husk or empty sea shell as until its own shell gets harder. After about a year, the teens of the species eventually find there are no shells left on the beach large enough to their bulk, so they move out altogether. From here on out, they live the rest of their lives out of the water — coconut crabs will drown if totally submerged.