Around 66 million years ago, the sky fell on the dinosaurs’ heads. An asteroid smashed into the Yucatan Peninsula, causing cataclysmic climate changes that marked the end of the Cretaceous period, and killed off some three-quarters of animal species. A small proportion of hardy birds survived, but the other dinosaurs went extinct.
Read More: http://www.theatlantic.com/science/archive/2016/04/the-long-diminuendo-of-the-dinosaurs/478668/
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