If we believe that Homo sapiens (a.k.a. people) and monkeys evolved from a common ancestor, then it makes sense to ask: Can monkeys use language like we do? Do they make mere sounds? Or do they use specific sounds to communicate a range of different intended things? Robert Seyfarth, a professor at the University of Pennsylvania, uses the case of the Vervet Monkeys to answer these questions. You can read more about his work in The New York Times.