We travelled for two days through the Serengeti to the Mara River in the hope of seeing migrating wildebeeste. After waiting less than an hour beside the Mara River, a group of wildebeeste started to cross. Once one led, hundreds followed. Their movement across the Serengeti-Mara ecosystem is driven by the rains, which this year have been unusually long. Wildlife photography always requires an element of luck as well as planning.