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

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 ...

Cover -- Contents -- List of Illustrations -- Preface -- CHAPTER 1. What Is a New World Monkey? -- What is a monkey? -- What is a platyrrhine? -- Platyrrhines and catarrhines -- Platyrrhine taxonomy - ...

Most people were taught a simple image: monkeys slowly turning into humans. That’s not how evolution works. Humans didn’t evolve from modern monkeys — we share a common ancestor with them, and if you ...