"A dark-colored small neck crab has chosen a particularly bad hiding place on a light-colored soft coral frond.  The neck crab is very small, at maybe 1 or 2 inches in size. A sort of ""decorator"" crab, it allows itself to be covered with other small organisms and algae to blend in to its environment.  At the ""Amber Head"" dive site, Turneffe Atoll, Belize."
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