Every year, the plains of East Africa play host to one of the world’s wildest wonders. The Great Migration is a high-drama spectacle starring more than a million wildebeest and hundreds of thousands of zebras and gazelle, all of them migrating in a clockwise loop around Tanzania’s Serengeti National Park and Kenya’s Maasai Mara National Reserve. The cycle of life unfolds along the perilous journey: Massive herds thunder across the plains and crash through rivers, while prowling lions and watchful crocodiles await.