Pleistocene North America’s Mass Extinction

From Science Daily:

During the late Pleistocene, 40,000 to 10,000 years ago, North America lost over 50 percent of its large mammal species. New findings … indicate that the extinction is best characterized as a sudden event that took place between 13.8 and 11.4 thousand years ago. …[F]indings support the idea that this mass extinction was due to human overkill, comet impact or other rapid events rather than a slow attrition.

via Why did half of N. America’s large mammals disappear 40,000 to 10,000 years ago?