Mô tả:It's the land we love and the land we think we know. We see America's breathtaking landscapes and wildlife as timeless, but the truth is very different. Its unique geography drives the forces of nature to extremes, shaping and reshaping the land and throwing down new challenges for life. Led by the iconic species that resonate with us most, journey through America's visually spectacular regions: the Frozen North, the Wild West, the Grassy Heartland, the Deep South and the Mountainous High Wilderness.