Wildebeest, also known as gnu ... The single greatest hurdle to the animals during this journey is the Mara River. Crossing points form bottlenecks in which thousands of animals perish through ...

Over a million wildebeest, 200,000 zebra and 350,000 Thomson gazelles ... After a dangerous crossing of the River Mara, the next few months are spent on the lush plains. The return to the south ...