'Barrel of Monkeys' Arrives at San Diego Zoo

A tufted capuchin monkey grooms another in their new exhibit at the San Diego Zoo. Six males and nine females - ranging in age from 1 to 35 years - have added some excitement to the Zoo's Lost Forest with their high-energy antics. They can be seen moving from one climbing structure to another using their prehensile tails.

The capuchin group, also called a barrel of monkeys, was part of a behavioral study at the Atlanta-based Yerkes National Primate Research Center, Emory University, where primatologists observed their behavior to learn more about their complex social interactions including altruism and facial recognition before coming to San Diego. Capuchin monkeys can recognize and remember those they've encountered in the past.