Another fact that supports this perspective is that the North American megafauna survived through numerous cycles of ice ages prior to the arrival of humans. Th

Another fact that supports this perspective is that the North American megafauna survived through numerous cycles of ice ages prior to the arrival of humans. There was nothing particularly unique or special about the last ice age, the only real difference was the presence of humans. One thing I find particular interesting though, is that there are likely two unique extinction events. One around 50KYA, that coincides with what I personally believe was the first peopling of the Americas, and another around 16KYA, which coincides with the arrival of North Americas current indigenous population.