About 66 million years ago, an asteroid slammed into the planet, wiping out all non-avian dinosaurs and about 70% of all marine species. But the crater it left behind in the Gulf of Mexico was a ...

Small fossils show mammals moved to the ground before the dinosaurs vanished. New plants changed habitats, giving better food ...

The number of dinosaurs may have been stable before the asteroid impact, despite evidence that species were getting less ...

The idea that dinosaurs were already in decline before an asteroid wiped most of them out 66 million years ago may be ...

The dinosaurs were not in decline before the asteroid hit, a new study finds. Instead, poor fossilization conditions and ...