Home to the biggest animal that exists 是现存的最大动物

286. To survive, they must find prey daily
     为了生存,它们必须每天寻找猎物
287. so their entire existence will be spent on the move.
     所以它们终生都在奔波
288. Over ninety percent on the living space for life on our planet, is in the oceans
     海洋占据着地球上90%的生存空间
289. Home to the biggest animal that exists
     是现存的最大动物
290. or has ever existed.
     也是史上最大动物的家
291. the blue whale.
     蓝鲸
292. Some weigh nearly two hundred tons
     有的重达200吨

来自《行星地球 第一季 第十一集 Planet Earth S01E11 海洋深处》第 289 行