Fossils reveal dinosaurs were flourishing in diverse ecosystems right up until the asteroid impact ended their reign.

There are some 700 known dinosaur species, but this number could change with more discoveries. Dinosaur footprints in the Connecticut River Valley rate as the first known evidence of dinosaurs ...

For a long time, the prevailing theory was that dinosaurs were already in decline before the Chicxulub asteroid struck Earth approximately 66 million years ago, leading to the extinction of about 70% ...