Add Yahoo as a preferred source to see more of our stories on Google. (Rui Palma/iStock/Getty Images Plus) Long before Megalodon ruled the seas, something just as unsettling may have lurked in the ...

It’s the stuff of science fiction. A kraken-like octopus that could grow to 60 feet long, prowl the oceans as a fierce predator, seize prey with long, agile arms and crush its catches with massive ...

The kraken — a gigantic, tentacled sea monster capable of dragging ships and sailors down into the depths — is a creature of Norwegian myth. But millions of years ago, a similar real-life animal ...

The ancient cephalopod, Nanaimoteuthis haggarti, appears to have been an apex predator that rivaled mosasaurs to rule prehistoric seas. A sketch of the giant octopus of the genus Nanaimoteuthis from ...

A "kraken-like" giant octopus might have been one of the most formidable predators around 100 million years ago, scientists have found. New research led by scientists from Japan's Hokkaido University, ...

At the time of the dinosaurs, the oceans were teeming with life. Below the waves, giant marine reptiles, such as the fearsome 4m (13ft) long mosasaurs, were the undisputed apex predators. In artistic ...