Human Ancestors Coexisted with Dinosaurs, Groundbreaking Study Finds

A recent study analyzing fossil records suggests that placental mammals, including human ancestors, coexisted with dinosaurs for a brief period before the mass extinction event that wiped out the reptilian beasts. The research estimates that about 21.3% of placental mammal families evolved during the Cretaceous period, just before the catastrophic event. The study also indicates that more modern lineages of placental mammals emerged after the extinction, possibly due to the lack of competition from dinosaurs.