This is one of best Tanzania Wildlife Safari Holiday. Migration safari lets you witness the Great Wildebeest Migration. Over 2 million Wildebeest, Zebra and Gazelles move through the Serengeti and Masai Mara ecosystem in search of green pastures and safe calving ground. The biggest chance to see river crossings on Serengeti Wildebeest Migration Safari is around July and August when the wildebeest migrate from the Serengeti in Tanzania to the Masai Mara in Kenya or around September and October when they cross the way around.