Koko's Ability To Communicate To Humans

I think that animals like Koko who has the capacity to communicate to humans are additional proofs that chimpanzees and humans may have come from the same ancestors as Charles Darwin postulated. As what I'd observed in the video, Koko learned how to communicate using sign language and he expressed his opinion about taking care of the Earth. In short, Koko is a wise man and his ability to think is only a human can does. Maybe, not as wide understanding as the modern man but still, he can think like a human.
If we compared the physical feature of man to an animal, the monkeys rather chimpanzees is the most likely of the man. According to scientist's study, there is changes in the human body of human, the changes in the shape and size of their