Besides being home to the Big Five, the Serengeti area is known for its black-maned lions (among other predators), and its birdlife is immense. But without a doubt, the greatest natural spectacle the Serengeti offers is the Great Migration, when more than a million wildebeest and nearly 200,000 zebras traverse the Serengeti ecosystem, flowing south from the northern hills in search of the new pastures created by the short rains each October and November, and then turning west and later north after the long rains of April, May, and June.