Steve Backshall continues his journey south and heads into Yellowstone National Park. This frozen wonderland is home to the grey wolf, but Steve will need all his tracking skills if he is to catch up with this elusive predator.
Next, the team trek through deep snow to find North America's largest land mammal, the one-tonne bison, but they get a much closer encounter than they bargained for. The expedition's next stop is North Carolina, where Steve braves the icy rivers to uncover a sinister creature known as the hellbender. Finally, in Texas, Steve hangs out amongst the largest congregation of predators ever seen on Deadly.