This 2012 artist’s rendering provided by the American Museum of Natural History shows a hypothetical placental mammal ancestor, a small, insect-eating animal. A study released Thursday, Feb. 7, 2013 details the family tree of mammals that have lengthy gestations before birth. It goes back to this shrewish critter slightly bigger than a mouse with a nasty set of teeth. And it first popped in the world a little more than 65 million years ago - just after the cosmic crash which is theorized to have caused the extinction of non-avian dinosaurs. (AP Photo/American Museum of Natural History, Carl Buell)
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