<i>“It puts to bed the whole idea that humans wiped them (megafauna) out,” said Dr. Clarkson. “We’re talking 20,000 to 25,000 years of coexistence.”</i><p>Does it? Is it not still possible that human populations increased, new (less mgafauna friendly) cultures emerged or subsequent migrations caused one of these? Humans co-existed with large animals in many places, before causing extinctions at later points.