National Post: Patagonia is littered with the bones of giants: sabre-toothed cats with huge, arcing cheek teeth, ground sloths that weighed as much as cars, bears that stood 10 feet tall. Throughout the last Ice Age, these creatures roamed the grasslands and mountain plateaus at South America`s southernmost tip.
And then, suddenly, they died out. While examining ancient specimens for a study on evolutionary history a few years ago, molecular biologist Alan Cooper realized that the species all seemed to disappear...