The black-headed uakari species was recently distinguished from other uakaris due to its morphologic and ecologic differences. New World monkeys, they live in the Amazonian rainforest of northern Brazil. Although they are adaptable to differing environments, population size is dwindling by at least 30% a year due to bushmeat hunting. Learn more about this week's Featured Primate Species.
Studies: Crows count, chimps know when they're right
BONOBO MONKEYS ~ Bonobos are a friendly bunch. These animals trade sex for almost anything. The monkeys will use the act for greeting others, conflict resolution, celebration and just about everything else.