One theory about the death of the dinosaurs is that they were wiped out by an asteroid about 66 million years ago. But a study suggests the dino population started declining 50 million years BEFORE the asteroid hit.
One possibility for the decline is an inability to cope with the way the environment was changing. The climate cooled and sea levels shifted, and the dinosaurs may have been subjected to new evolutionary pressures.
BBC: Dinosaurs 'in decline' 50 million years before asteroid strike
Here's another article I found that goes into more lengthy explanations: The Long Decline of the Dinosaurs.
Why do you think the dinosaurs went extinct?
Comments rated to be Good Answers:
Comments rated to be "almost" Good Answers: