In North America over 10,000 years ago, animal giants ruled the land. The most formidable predators to ever walk the earth, sabertooth cats short faced bears and dire wolf packs, preyed on in the ongoing struggle to survive. With stunning animation and CGI, National Geographic explores the mass extinction of the three most powerful prehistoric predators.

The dire wolf, a fierce and powerful alpha predator in the savage ice age, was larger and more powerful than any modern-day wolf. Why did it suddenly perish while the smaller, weaker gray wolf survived?