About 66 million years ago, dinosaurs ruled the Earth in a very different environment than we see today, with some creatures demonstrating indomitable power, while others thrived in different ways.

Scientists studied ancient fungal spores and discovered Earth may already have been under stress before the asteroid wiped out the dinosaurs.

While dinosaurs stood no chance when a massive asteroid hit Earth 66 million years ago, microscopic plankton bounced back surprisingly fast. The Cretaceous-Paleogene (K-Pg) extinction event devastated ...

A great Tyrannosaurus rex strides through the conifer trees of her territory, sniffing the air. She picks up the scent from the carcass of a dead horned dinosaur, Triceratops, that she was feeding on ...

In all, 75% of Earth's species went extinct, including the nonavian dinosaurs. So how did some animals ‪—‬ including species ...