The most famous mass extinction was the disappearance of non-avian dinosaurs at the end of the Cretaceous period, 66 million years ago, after ruling the Earth for 170 million years. The best-supported extinction model is the impact of a large asteroid at Chicxulub, Mexico. However, it is widely debated whether dinosaurs were in decline or not before the Chicxulub impact. A study in the journal Nature Communications provides new evidence for an environmentally-driven...
