Sharks probably have the “roughest” skin. Their skin is covered in tons of tiny, teeth-liked projections called “denticles”. In fact, it has been theorized that teeth evolved from denticle-like structures in primitive fish. Denticles vary by species, but can be as rough as sandpaper — and can easily tear skin. They are usually aligned facing backward and rubbing your hand from head-to-tail the shark will seem smooth. Rubbing the other way could give nasty scrapes. These denticles create tiny vortices which reduce drag and improve swimming efficiency.
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