An asteroid strike 66 million years ago caused millions of species to go extinct—including many mollusks. By studying the ...

According to scientists who maintain that dinosaur extinction came quickly, the impact must have spelled the cataclysmic end. For months, scientists conclude, dense clouds of dust blocked the sun ...

Dinosaurs finally met their end, but only partially. Many of their descendants—modern birds—are currently threatened by extinction, with hundreds of species at risk due to human activity.