This is the molted shell of an a’ama crab, seen on the North Kohala shore. A’ama crabs are numerous around the Big Island and they scuttle away when disturbed. But while these crabs are black, their molted shells turn red in the sun, as this one has.
Graham's Island 
Something rather poignant about the molted shell!
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I marvel at how perfect they are. Exactly how do you shed a shell that perfect?
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It is incredible – even the details of the legs and eyes are intact.
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I know. I don’t see how that’s possible. I’ve seen molts from praying mantises that are inexplicable to me.
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