The stage of one of nature’s greatest dramas: the annual migration of more than two million herbivores The great Serengeti migration is the movement of an estimated 1.5 million wildebeest (less familiarly known as “gnu”), 750,000 zebra, and a smaller number of Thomson and Grant gazelle. The leaders of the herds appear to be the zebra, while the wildebeest, though much larger in numbers than the zebra, appear to be muddle-headed in their decision-making regarding routes and timing. The migrating animals move in a circle west across the Serengeti Plain (the gazelles drop off at this point) and then north into the Maasai Mara in Kenya. Then they turn back south into the Serengeti again by February, where the wildebeest mothers give birth to their young. The wildebeest seem to be on the move all the time. The migrating herds, as they thunder over the plains in search of fresh grass and water, present an awe-inspiring sight.