Around 50,000 years ago, North America was teeming with megafauna. Mammoths roamed the tundra, while towering mastodons, saber-toothed tigers, and enormous wolves inhabited the forests.

50,000 years ago, North America was ruled by megafauna. Lumbering mammoths roamed the tundra, while forests were home to towering mastodons, fierce saber-toothed tigers and enormous wolves.

And absence of other megafauna in kill sites doesn't mean ... Scholars generally agree that North America witnessed some rapid climate adjustments as it shook off the Ice Age beginning about ...