Found on the southern coast of Peru, this amphibious creature had a tail and hooves and was the oldest preserved fossil of ...

But a new discovery from University of Pisa paleontologists may dethrone the blue whale in favor of a prehistoric cetacean ...

The biggest blue whale ever recorded weighed 190 tonnes, according to Guinness World Records. But the researchers estimated the ancient whale’s weight range was between 85 and 340 tonnes ...

Once four-legged land animals, whales evolved from ancestors Pakicetus, which lived along ancient Pakistani shores ...

This image shows the upper jaw and skull of Maiabalaena nesbittae. Whales were the first mammals to evolve baleen, and no other mammal uses any anatomical structure even remotely similar to it to ...

It's the tale of an ancient land mammal making its way back to the sea, becoming the forerunner of today's whales. In doing so, it lost its legs, and all of its vital systems became adapted to a ...

One of the first cetaceans, Pakicetus, was a goat-sized creature that lived along the banks of lakes and rivers in ...

"The anatomical differences between whales and terrestrial mammals are so great that innumerable in-between stages must have paddled and swam the ancient seas before a whale as we know it appeared ...