- For many animals, the only way to survive the most hostile times
动物们想要在最严苛的环境里活下来 - is to keep moving.
就必须不断迁移 - In the Kalahari, brief rains have given way to the dry season.
喀拉哈里沙漠短暂的雨季已被旱季替代 - Food and water are becoming increasingly scarce.
食物和水愈发稀缺 - For these zebra, it's time to leave.
这群斑马是时候离开了 - They're setting off on the longest overland migration
斑马的迁移距离称霸 - made by any mammal in Africa,
所有非洲哺乳动物