Africa has a name for the most magnificent beasts on the continent. The legendary Big Five: Elephant, Lion, Water Buffalo, Rhino and Leopard. But now, there are other giants that must be recognized. Half a world away, there is an ensemble of creatures born of equal power and majesty. A new Big Five: the titans of North America. America's Greatest Animals takes us across North America on a revelatory mission: which of the continent's landmark creatures deserve to make the list? Which iconic giants command our highest level of respect, reverence and fear?