Xenacanthus was a 3-to-5-foot freshwater shark which fed on crustaceans and small fish. It lived from the end of the Devonian ...

Think the shark in ‘Jaws' was huge? Find out how big great white sharks really get and how they compare to megalodons and ...

Two 325-million-year-old ctenacanth shark fossils discovered in Mammoth Cave shed light on ancient marine ecosystems.

News. NASA announces that a rare supermoon will pass near Earth: What impact will it have on the planet? News. Scientists make gigant discovery in the depths of the sea that could change the way ...

The massive Megalodon had a staggering 100,000 kilocalories-per-day nutritional demand—which it didn't always fill as expected.

A new study reveals Megalodon wasn’t a picky eater, feasting on whatever prey was available at multiple levels of the food ...

National Megalodon Day is June 15 and celebrates the close relative to predatory fish, one that ruled the oceans 15 million ...

The megalodon is the largest shark to have ever lived in the world's ocean, according to the Smithsonian. The prehistoric shark lived between 23 to 3.6 million years ago and was about three times ...

Back in the dinosaur era, the Lamniformes diverged ... "You had these two pathways [to gigantism]," says Pimiento. "This big 20m (66ft) shark is no longer here. But the other almost 20m (66ft ...