Are manta rays smart

well sharks are not very smart, they have bad eye site but have the best sense of smell than all fish. example: you cut your foot on a sharp rock, its starts bleeding a shark may smell it 10000 miles away in the ocean. when sharks eat us or bite us they don't mean to, they possibly think your a seal because sharks think our blood tastes very bad when the swallow it they throw it up again. they think your a seal because your flopping your legs and arms everywhere so sharks are not that smart