That is an assumption. It did not happen in Africa. In North America, megafauna (dire wolf, saber-tooth cat, cheetah, horse, camel, mammoth, mastodon, giant s

That is an assumption. It did not happen in Africa. In North America, megafauna (dire wolf, saber-tooth cat, cheetah, horse, camel, mammoth, mastodon, giant sloth, 30+ genera) were killed off not by human activity but by a comet strike c.10818 BCE. It did in the Clovis culture, too. There were simultaneous extinctions in South America and Africa.