During the Pleistocene Epoch, North America was home to a diverse array of megafauna—large animals that dominated the continent’s landscapes. These creatures, some of which are now extinct, played ...

Not cute and endearing like present-day sloths in South America, these sloths were one of the strangest animals of the ice age. They weighed as much, or more, than the short-faced bear at 1 tonne ...