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Grasslands cover one quarter of all land and support the greatest gatherings of wildlife on Earth. The extraordinary creatures that live here must survive the most hostile seasons on the planet. From bizarre looking Saiga antelope in Asia, rarely seen by humans, to the giant ant-eaters of Brazil, grassland animals show remarkable survival techniques. In the flooded Okavango, lions take on formidable buffalo in epic battles, stunning bee-eaters ride on the back of ostriches like miniature jockeys, while caribou embark on great migrations, where they must cross paths with their nemesis, Arctic wolves.