Yet, North America’s megafauna had survived previous cycles ... with human predators—at unsustainable rates, driving them to extinction. This hypothesis still isn’t completely proven ...

(See a list of all 35 vanished genera of North American Ice Age mammals ... we're also talking about collapses for megafauna that didn't actually go extinct." (Researchers have found evidence ...

“In South America,” the authors explain, “the extinction of megafauna has been attributed to many causes, climate/environmental changes or even the synergy between these hypotheses.

and David J. Meltzer. 2004. “North American overkill continued?” Journal of Archaeological Science 31:133-136. Barnosky, Anthony D. 2008. “Megafauna biomass tradeoff as a driver of ...