mammals

In a Peruvian desert, scientists discovered the fossils of an extinct whale with a big bite. The whale's teeth and jaws were so powerful that it feasted on other whales.

What the planet’s past mass extinctions tell us about the future of life on Earth

The crash-landing of a 10-kilometer-wide asteroid 65 million years ago made for a very bad day for dinosaurs — or one very lucky day for mammals.