Study: Ancestor of placental mammals lived shortly after dinosaurs

02/8/2013 | ScienceMag.org

A small furry creature that evolved less than 400,000 years after dinosaurs died out could be the ancestor to more than 5,000 mammal species today, according to a study published in Science. The study looked at a database of genetic information for various species of placental mammals to determine their family trees, and found that the period after the dinosaurs disappeared was the "big bang" for the diversification of mammalian species.

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