The most recent ice age was dominated by gigantic mammals like the mammoth, woolly rhinoceros, and saber-tooth cat. But there's an evolutionary mystery here. How did these animals enter the ice age already perfectly adapted for such brutally cold climates?
Over two thousand years ago, the Greeks discovered the fossilized thigh bone of a giant mammal that had roamed their country a million years ago. This bone may have helped inspire Greek legends of strange and giant creatures.