Narration by David Attenborough:

Within the high country of ponderosa pines and douglas fir, great herds of pine sticks still roam free. Majestic fallen branches with their bark coatings to protect them against the harsh winters and snow.

And to match their lofty heights are the last remaining predators. The North American Blue Merle wolf.

After a long pursuit through the high country, the hunt has ended. Prey pounced and pulled down. Chewed to sustain that which lives...