"The extraordinary annual Great Migration of wildebeest and other grazing herbivores across the Serengeti-Mara ecosystem is one of the greatest spectacles in the natural world. Over two million herbivores partake in this journey, with about 200,000 zebra and 500,000 Thomson's gazelle behind the main players... one-and-a-half million wildebeest!"
Read more at and check out the interactive migration map. And for even more facts, read this fact file.
Also view the migration in this National Geographic video.