Big animals that evolved alongside us (elephants, lions, hippos, etc) have not been wiped out. Most of the North American big mammals got wiped out because they

Big animals that evolved alongside us (elephants, lions, hippos, etc) have not been wiped out. Most of the North American big mammals got wiped out because they were suddenly exposed to human big-game hunters who had been hardened by thousands of years of living in the Siberian wastelands. Those North American animals didn't have the benefit of a long genetic memory telling them that the soft hairless ones are actually the most deadly predators on the planet...