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Hold on to your Stetsons! Things get really wild tonight as this stunning three-part series about America’s legendary Great Frontier heads to the mountainous High Country.

It takes a hardy species to survive here in the Rockies and Sierra Nevada desert, as the seasons throw all sorts at their residents, from bitter winters to scorching summers.

Among our favourite stories are those of a parasitic plant which provides a lifeline for the lovely Anna’s hummingbirds, oh-so-cute little pikas on their quest to stockpile food for winter, and an episode-stealing naughty baby black bear who nicks food from a family of acorn woodpeckers!

We also meet some of the human residents, including hardy cattle ranchers. Magnificent stuff!