Savage-Rumbaugh asks whether uniquely human traits, and other animals' behaviors, are hardwired kwa species.

Baby orang-utan Karen, who is actually an ape, not a monkey, has a hole in her heart. She lives at San Diego Zoo where the operation took place.

With mouthfuls of mealworms, this family of Golden Lion Tamarins works for their food. Jorge Ribas hangs out with the curious monkeys.