The biology books say that sharks and rays make the group of cartilaginous fish, less evolved than most of the other species, that make the group of the bonny fish. Still, sharks, with their highly developed senses and teeth, make the top predators of the seas.
Paradoxically, the two largest species of shark, that make also the largest fish species, are harmless for people, being plankton feeders, like the whales: the whale shark (Rhincodon typus) (up to 20 m (66 ft) long and 34 tonnes in w...
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