Instead, hermit crabs have a hard exoskeleton on the front part of their bodies but a soft tail on the other half, which they protect using the discarded shells of other animals, like whelks.
One morning on St. John, U.S. Virgin Islands, photographer Steve Simonsen captures thousands of hermit crabs migrating What Is an Aurora? (03:13) National Treasure: The Fearsome Science Behind the T.
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