Mammoths to Manhattan travels through time, from the end of the Ice Age to the present day, to see how North America's ildlife has adapted to living alongside people. Back then, it was a land dominated by giant beasts, today it is a land of towering skyscrapers. The episode starts with the extinction of its biggest mammals, some two thirds of which disappeared soon after the first people arrived.

The show’s own verdict is on its page.