Shark

The broad category shark encompasses many different species of fish with cartilaginous skeletons. But when people use the word "shark," they usually refer to large and carnivorous apex predators. We know these sharks best for their intelligence, longevity, and sleep swimming.

Counted among the oldest vertebrates on Earth, some -- but not all -- species of shark survived mass extinction and ocean acidification. They remain relatively rare examples of fish in the warmed, acidified, cephalopod-rich oceans of the Fifth World.

#Human relations

People who live on the coast sometimes hunt sharks for their meat. Those who do will use their sharp teeth in jewelry.

#Shark People

A community specializing in relationship with sharks will invariably live on or near the sea.

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