Some of them, like the giant sloth or the woolly rhino ... Its powerful tail could crush a human skull, and its shell-like ...

Mylodon darwinii is the scientific name for a species of extinct giant ground sloth ... is the scientific name for a species of extinct ground sloth, first described based on a partial skeleton ...

By Jeanne Timmons Ground sloths emerged in South America tens of million years ago, eventually ranging as far north as Canada. While their modern relatives dwell in trees and top out at the size ...