A monkey descending a tree trunk often keeps its head up, moving almost like a cautious climber backing down a ladder. Squirrels and many other mammals, by contrast, tend to go headfirst. That ...

Add Yahoo as a preferred source to see more of our stories on Google. Mammals descend trees in different ways, and primates stand apart. (CREDIT: Andrew Mercer / Wikimedia Commons / CC BY-SA 4.0) A ...

Three tiny Purgatorius teeth found in Colorado are helping scientists trace how early primates evolved and spread across ...

Sixty-six million years ago, a massive asteroid smashed into Earth. Life has undergone at least five mass extinctions in the ...

Fossils show that howler monkey ancestors, Stirtonia victoriae, were eating leaves 13 million years ago, altering body size ...

A few teeth, smaller than a grain of rice, are changing the map of your earliest primate relatives. They come from a creature called Purgatorius, a tiny tree-dwelling mammal that lived about 66 ...

Tiny, tooth-sized fossils have just reshaped the story of our deepest ancestry. Paleontologists have discovered the southernmost remains ever found of Purgatorius—the earliest-known relative of all ...

Your body is a living museum of evolution, carrying within it the remarkable story of our species' 6-million-year journey from tree-dwelling primates to ...

Thirteen million years ago, a group of medium-sized monkeys known for guarding their territory among the treetops with fearsome "howls" started doing something new. These monkeys, among the oldest ...

New, miniscule fossils of the earliest-known relative of all primates, including humans, Purgatorius, have been unearthed in a more southern region of North America than ever before – and the ...

An extinct relative of the howler monkey may have been the first leaf-eating primate in South and Central America ...

Picture two ancient apes in a lush African forest, gently pressing their mouths together, not for romance, but as a primal bond. Fast forward 21 milli.