The sabre-tooth tiger, known as smilodon, was one of the few sabre-toothed cats that would have encountered humans. Whilst sabre-tooths in Africa and Europe became extinct before our species had evolved, Smilodon survived until the end of the ice age. Three species lived in the Americas over time. The ancestors of the Native Americans might have met two of these, Smilodon fatalis and Smilodon populator. The latter was a heavily built animal, weighing more than a Siberian tiger.