The evolution of the shark is not what most people would expect. Instead of sharks evolving from a massive predator, the original creature was a small, leaf-shaped fish. This fish lacked eyes and fins ...

The megalodon, a giant shark that went extinct some 3.6 million years ago, is famous for its utterly enormous jaws and correspondingly huge teeth. Recent studies have proposed that the megalodon was a ...

Some sharks are defined by more than just their size—their teeth are what truly set them apart. From razor-sharp rows built ...

More than 500 specimens believed to be about 20 million years old have been unearthed in Fremont. The fossils include teeth from the biggest prehistoric shark and what appears to be an entire whale ...

Biodiversity loss isn’t just about losing species — it’s about losing the evolutionary traits and ecological roles that make those species unique. A new study on requiem sharks (Carcharhinus) shows ...

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PORTLAND, Maine -- Sharks are the most feared predators in the sea, and their survival hinges on fearsome teeth that regrow throughout their lives. But changes in the ocean's chemistry could put those ...