See the greatest wildlife show on Earth For the sheer volume of wildlife, there’s nothing quite like the Annual Great Migration. The largest mass movement of land mammals on Earth, this annual cycle sees over one million stampeding wildebeest and other grazing herbivores journey around 1800 miles from the Serengeti in Tanzania over the border into Kenya’s Maasai Mara and back. To see the herds, you’ll need to visit at the right time. Driven by ancient instinct, a rough pattern occurs each year as the herds follow the rains to secure a good water supply and fertile grass. The migration can usually be seen in the Maasai Mara from July to September , and August is typically the best month to see the famous river crossings . Seeing the herds in the Serengeti is typically less crowded and more affordable. The best time to see the herds is typically October to July. Lodges in the central Serengeti are ideal for witnessing the herds passing through on their way to and from the Mara.