Long before whales and sharks, enormous marine reptiles dominated the oceans with unmatched power. Scientists have reconstructed a 130-million-year-old marine ecosystem from Colombia and found ...

Long before mammals dominated the land and even before the most famous dinosaurs appeared, Earth was home to a wide variety of powerful predators. While dinosaurs often get most of the attention when ...

In Yellowstone National Park — where gray wolves were reintroduced starting in 1995 — researchers have gone back and forth on whether the restoration of wolves has impacted the ecosystem. The idea is ...