Jan 04, 2014 07:10 AM EST
New World Monkey Family Tree Reconstructed
When monkeys landed in South America about 37 million years ago, the long-isolated continent teemed with 30-foot snakes, giant armadillos and strange, hoofed mammals. Over time, though, these monkeys forged their own niches across the New World as they evolved and spread. Now, scientists have applie...