Primates' Ancestors May Have Left Trees to Survive Asteroid

Primates' Ancestors May Have Left Trees to Survive Asteroid
(AP Photo/Silvia Izquierdo)

When an asteroid struck 66 million years ago and wiped out dinosaurs not related to birds and three-quarters of life on Earth, early ancestors of primates and marsupials were among the only tree-dwelling (arboreal) mammals that survived, according to a new study.

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