Nature

PBS | 8:00 pm

The two-part "Born in the Rockies" concludes with "Growing Up," in which young animals still learning basic life and survival skills confront even starker challenges as winter closes in on the slopes of the Rocky Mountains. As a grizzly mother prepares her cubs for their first hibernation together, a mountain lion continues raising her kittens and a bison calf struggles to learn how to navigate a heavy snowfall.