This is the name of this major and annual animal move between Kenya and Tanzania. Between 1.5 and 2 million gnus (wildebeests), several hundred thousands of zebras and some more antelopes follow a wide triangular geographical pattern to find the lands with the best possible grass depending on the rains and the temperatures. l had tis shot in august and Masai Mara was full of gnus everywhere, they were looking very tired after crossing, wild cats, etc.. l used very slow shutter speed to emphasize these exhousted feet.