LONG before the United States came to exist, North America was populated with giant and exotic creatures that are now extinct.
Time travelers visiting the continent tens of thousands of years ago might have come face-to-face with animals towering sloths and even a cheetah.
GettyThis is what a giant ground sloth Megalonyx would’ve looked like while searching a tree for food in an Ice Age Ohio forest[/caption] American Museum of Natural HistoryMegalonyx lived from 5 million to...