Us
Six million years ago a couple in Africa had two sons and their names were Cain and .... Let me try that again. Six million or so years ago there was a population of apes living in Africa who shared a lot of DNA (like 99%) with their surviving descendants, chimpanzees, bonobos and humans. They probably looked a lot like those descendants, had brains about like chimps, were hairy like chimps and gorillas, and walked like them, but we really don't know because there is no trace of them in the fossil record. Some of their offspring became chimps and bonobos, but we don't know much about their evolution since they didn't leave any trace in the fossil record for another 5 plus million years. Other branches did start leaving traces a couple of millions of years later and they tend to be chimp sized, with chimp sized brains, but may have walked slightly more like humans. By about three million years ago some definitely upright walkers appeared. They were still about...