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 ...

Fossils show that howler monkey ancestors were eating leaves 13 million years ago, shaping body size and evolution.

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

When you learned about the history of human evolution in school, there's a good chance you were shown one all-too-familiar image. That picture probably showed a conga line of human-like creatures, ...

A fossil that would fit on a baby’s fingertip has revealed fresh clues about the evolution of the earliest-known relative of ...

Introduction / Christina J. Campbell -- Morphology and evolution of the spider monkey, genus Ateles / Alfred L. Rosenberger ... [et al.] -- The taxonomic status of spider monkeys in the twenty-first ...