✽ Hundreds of hooves thunder, announcing the herd’s approach. A cloud of dust rolls closer. The low mooing of wildebeest is within earshot. Every year, when the seasons change in Eastern Africa, millions of large herbivores journey to find food and water. Along the way, zebras, gazelles, elephants, and other animal icons evade predators, cross treacherous rivers, and risk deadly diseases. The largest of these mass migrations, a 300-mile loop across Kenya and Tanzania, has been nicknamed the .