The Greatest Wildebeest Migration in Serengeti National Park is primarily caused by nature’s survival cycle, driven by the search for fresh grazing and water and dictated by the seasonal rains in the Serengeti–Mara ecosystem. During this migration, over 1.5 million wildebeest, along with zebras and gazelles, move continuously across the Serengeti ecosystem in a never-ending circular journey in search of life-sustaining resources. The best months to witness this world’s greatest wildlife movement are from December, January, February, to March, May to June, and July, August, September to October, in different regions including Southern Serengeti, Western Serengeti, and Northern Serengeti.