The Great Wildebeest Migration is the largest animal migration in the world. Every year, more than 2 million animals (wildebeest, zebra, and gazelle) migrate in a clockwise direction across the ecosystems of the Serengeti (Tanzania) and the Masai Mara (Kenya) From June to October, the annual Wildebeest migration takes place when thousands of these animals sweep across the plain and seek out new grazing areas, a full day game drive with picnic lunch at the hippo pool on the banks of the Mara River were the crossing of the Gnus [wildebeests] takes place while the killer crocodiles awaits