Nature on the Move
Race to Survive – Beginning their journey off the Alaskan coast, the Pacific walrus – whose bodies are not made for swimming long distances – have used ice floes for eons as sanctuaries for rest and breeding as they journey to Russia and back. But in recent years the floating ice chunks have become fewer, smaller and unable to sustain the walrus population that struggles to occupy these insufficient life rafts. (Photo Credit: © Paul Nicklen/ National Geographic)
Race to Survive – Africa: Every spring in Botswana, hundreds of zebras leave the largest inland delta in the world on a 150-mile slog into hell – a desert of salt and sand – so that their bodies can take in much-needed minerals. Their stripes help protect them from predators as long as they stick together – blurring their lines and making them indistinguishable as individual animals. (Photo Credit: © John Conrad/CORBIS)
Race to Survive – Western Wyoming, Grand Teton National Park: In the untamed early days of the American West, pronghorn were plentiful, proud and moved freely. One small herd of around 200 follows its ancient migration. Driven by the seasons, their migration from the mountains to the valleys and back has always been a tough journey, but now fences, borders, bloated rivers and other constraints have created blockades and bottlenecks that result in devastating losses for this critically endangered species. (Photo Credit: © Joe Riis)