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 ...

Don’t Miss a Moment. Join 30,000 locals who stay current on San Antonio news, culture, and events. Get our free newsletters in your inbox three times a week. The idea that eating less can prolong life ...

• 13 million years ago, a medium-sized monkey known for guarding its territory among the treetops with a fearsome “howl” started doing something new. This monkey, one of the oldest known ancestors of ...