Thousands of zebra face lions, hunting dogs, drought and starvation as they undertake the world’s most recently discovered migration. Braving one of Botswana’s most brutal wildernesses, they make Africa’s longest land migration to reach the rich grasslands of Nxai Pan National Park. Liz Bonnin leads a team of scientists and film-makers using cutting edge technology to attempt something that has never been done before – following the zebra on the ground, every step of the way, to reveal the secrets behind this brand new discovery.