Serengeti National Park, in northern Tanzania, is known for its massive annual migration of wildebeest and zebra. Seeking new pasture, the herds move north from their breeding grounds in the grassy southern plains. Many cross the marshy western corridor’s crocodile-infested Grumeti River. Others veer northeast to the Lobo Hills, home to black eagles. Black rhinos inhabit the granite outcrops of the Moru Kopjes.