Landmark study reveals that dinosaurs dominated the world right up until a deadly asteroid hit Earth, leading to their mass extinction, around 66 million years ago. The findings, which were published in the journal Science Advances on December 7, provide the strongest evidence yet that dinosaurs
A new study provides the strongest evidence yet that the dinosaurs were struck down in their prime and were not in decline, at the time the asteroid hit.
Scientists have long debated why non-bird dinosaurs, including Tyrannosaurus rex and Triceratops, became extinct – whereas mammals and other species such as turtles and crocodiles survived. Mammals didn’t just take advantage of the dinosaurs dying, experts say. They were creating their own advantages through diversifying – by occupying new ecological niches, evolving more varied diets and behaviors, and enduring small shifts in climate, by rapidly adapting. These behaviors probably helped them to survive, as they were better able than the dinosaurs to cope with the radical and abrupt destruction caused by the asteroid.
First author, Jorge García-Girón, Geography Research Unit, University of Oulu, Finland and Department of Biodiversity and Environmental Management, University of León, Spain, said: “Our study provides a compelling picture of the ecological structure, food webs, and niches of the last dinosaur-dominated ecosystems of the Cretaceous period and the first mammal-dominated ecosystems after the asteroid hit.
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