An article published in the journal “Journal of Evolutionary Biology” describes a research on mammal species that became extinct at the end of the Cretaceous period and concluded that they were more than 90%, far more than previously thought. Another article, this one published in the journal “Proceedings of the Royal Society B”, describes a research showing how the mammals that survived that extinction evolved three times faster in the first 10 million years of the Paleogene period than in the previous 80 millions.