Size comparison of a modern blue whale (Balaenoptera musculus) and the extinct Perucetus colossus, known from a fossil discovered in Peru. Researchers initially estimated the mass of Perucetus as ...

For its last meal, an ancient marine reptile called an ichthyosaur may have bitten off more than it could chew. The dolphinlike creature was nearly 5 meters long, about the length of a canoe. And its ...

Researchers have re-estimated the weight of Perucetus colossus — a bizarre species that lived 39 million years ago — and claim it's much lighter than a blue whale. When you purchase through links on ...

A new fossil that captures both birth and death reveals the earliest ancestors of the giant prehistoric sea predators called ichthyosaurs birthed their babies headfirst, according to a new study. The ...