This three-part series journeys the length, breadth, and height of the Andes to reveal the incredible natural history of the longest mountain range on earth. In the Northern Andes, rising mountains and erupting volcanoes have produced a stunning variety of life. Boasting poison frogs, legless amphibians, high-flying monkeys, the continent"s only bears, and the world"s last tropical glaciers, the Northern Andes are unlike anywhere else on Earth.