The “Primeval” Mammoth is about a third larger than its real-world counterpart, the Columbian Mammoth. Mammoths were an incredibly successful group of herd herbivores that dominated the open grasslands between the recent Ice Ages. In fact, they only died out a few thousand years ago. Many scientists believe their extinction was related to the rise of humans. The Columbian Mammoth was one of the largest of the mammoths and, because it lived in temperate North America, it did not have the heavy fur of its more famous cousin, the Woolly Mammoth.