8. Cretoxyrhina These sharks lived all around the world until about 80 million years ago. They competed with pliosaurs and mosasaurs for food, as they all ate large prey. One of these prey, a 20 ...

Over one quarter of all known shark species are considered threatened or endangered. Sharks are apex predators in many ecosystems, and their disappearance is causing dangerous imbalances in marine ...

No bu Tamura/Wikimedia Commons The Carboniferous Period, which began 359 million years ago, is known as the ‘golden age of sharks’. An extinction event at the end of the Devonian killed off at least ...

But with 510 species of shark and 650 species of ray, what do they really have in common? Well, all sharks and rays share some fundamental features. ...with 510 species of shark and 650 species of ...