(A long discussion of animal communication can be found in my book.) In the last 40 years, there have been many apes that have been taught to communicate with humans using sign language or other means, but the most famous among them are Koko the gorilla, Washoe the chimpanzee, and Kanzi the bonobo. These are … More Koko, Washoe, and Kanzi: Three Apes with Human Vocabulary