Yellowstone

As the spring melts the winter snow, the full extent of Yellowstone is gradually revealed. Now, from the surrounding lowlands herds of elk, pronghorn and bison return from their winter feeding grounds to take advantage of America's richest natural grasslands. Grizzly bears emerge from hibernation to teach their young to hunt fish and how to survive in the Alpine peaks. But just as it seems the easy living of summer has arrived, a new danger emerges.

An early autumn dusting of snow is a sign for elk to start moving down from the mountains to focus on finding food in the valleys below. Although the wolves are waiting for them, the male elk are distracted, they are fired up and ready to fight each other for the right to breed. Beavers get busy in a rush to repair dams and stock underwater larders before ice freezes their ponds. The white bark pine provides nuts to help fatten up grizzly bears and squirrels alike, as all the animals make preparations for another harsh winter season.