Documentary following thousands of zebra as they face lions, hunting dogs, drought and starvation to undertake the world's most newly discovered migration. Braving one of Botswana's most brutal wildernesses along the way, the animals make Africa's longest land migration to reach the grasslands of Nxai Pan National Park. Liz Bonnin and a team of scientists and filmmakers use cutting-edge technology to capture the zebra every step of the way, and reveal the secrets behind the brand new finding