Call it an unfinished story, but with a plot that's a grabber. 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 ...

In this illustration provided by Ruairidh Duncan a Janjucetus dullardi is depicted chasing a fish. Ruairidh Duncan / AP WELLINGTON, New Zealand — Long before whales were majestic, gentle giants, some ...

The blue whale has long been considered the largest animal to have ever existed, even dwarfing the biggest known dinosaurs. But now a new species threatens to steal the crown, and upends what we ...

Long before whales became the gentle giants of today, some of their ancestors were small, fierce, and strange. A chance find on an Australian beach has revealed a rare, entirely new species, ...

Long before whales were majestic, gentle giants, some of their prehistoric ancestors were tiny, weird and feral. A chance discovery of a 25 million-year-old fossil on an Australian beach has allowed ...

Researchers in Egypt found the fossil of an extinct, four-legged whale that lived both on land and in the sea. It weighed around 1,300 pounds and had a head shaped like a jackal's, and a powerful jaw.

We explore the origin of the Mystacodon, what we know today as baleen whales. Mystacodon is the earliest known mysticete, the group that, today, we call the baleen whales. But if this was a baleen ...