This scuba diver had to back out of the way when this massive whale shark, Rhincodon typus, came cruising through. The skin of the whale shark is comprised of dermal denticles, backwards facing skin teeth that channel the water improving hydrodynamics. If you ever get a chance to feel shark skin it is smooth one way and rough, like a cat's tongue the other. Whale sharks are so large that if they bump into you their dermal denticles will draw blood. I know from experience.
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