A newly described dinosaur that appears to have persisted beyond a catastrophic die-off is forcing scientists to rethink how mass extinctions actually play out on the ground. Instead of a clean break ...

Silhouette of the Tyrannosaurus called Stan. This "tyrant lizard king," was excavated and prepared by the Black Hills Institute. © Louie Psihoyos/CORBIS What ...

Some of their dinosaur-like traits are their bone structure, strong leg muscles for bipedal walking, sharp claws, and the ability to defend themselves by kicking. The Triassic-Jurassic Extinction ...

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An asteroid strike 66 million years ago caused millions of species to go extinct—including many mollusks. By studying the impacts of this ancient event, scientists hope to ensure that mussels, ...

The Cretaceous Era—roughly 145 to 66 million years ago—was the last hurrah of the dinosaurs. A massive asteroid impact brought them to a violent end, but there’s more to the story. The Cretaceous ...

Dinosaurs have been fearsome and fascinating — but tragic? When science said dinosaurs were pea-brained and cold-blooded, humans took their demise as proof of the superiority of warm, clever mammals.

Rocks formed immediately before and after non-avian dinosaurs went extinct are strikingly different, and now, tens of millions of years later, scientists think they’ve identified the culprit—and it ...

Dinosaurs ruled the Earth for over 150 million years. Compared to the mere 4–6 million years that scientists believe humans and their earliest ancestors have been on the planet, it wouldn't be ...