Why bison hunters abandoned a kill site 1,200 years ago

Breakthroughs, discoveries, and DIY tips sent six days a week. Bison are an enduring and iconic symbol of North America's vast Great Plains. The large mammals have been hunted for thousands of years, and were almost driven into extinction in the late 1800s. Over thousands of years, bison hunters used different sites, but why they abandoned hunting grounds has been an archaeological mystery. For the Bergstrom site in present-day Montana, climate change may have been to blame.