When Dr. Sue started working with Kanzi, he was already a few years old. Teco, however, has been learning new skills since birth, and Lisa says he is already doing things that no bonobo has ever done. "He sucks his thumb and uses a pacifier, which is pretty unprecedented," Lisa says.

Lisa says that studying these bonobos can teach us something about all animals.

"For anyone who believes that animals don't have feelings or can't comprehend things, this is a clear example of the fact that there is communication between [animals and humans]," she says.