This was taken in 2011 and shows part of a crossing of the Mara River of around 100,000 wildebeest and zebra. We estimated a 2% fatality rate, mainly due to drowning. A single crocodile killed a couple of young wildebeest but seemed to be overwhelmed by the sheer number of animals that crossed. Some calves were crushed underfoot as they tried to climb the far bank.
The quality is not great, but at least it gives an impression of what it was like.