The Serengeti migration:
The whole thing here.It's one of the great sights of the animal kingdom. In the days of the wild west, American explorers used to report how bison would thunder across the plains for days. Today, the bison have almost vanished, and the wild west too, but here in east Africa herds of wildebeest and zebra still darken the land until they vanish into the distant blue horizon.
Cross-posted on Indian Writing.