They escape from visiting ships, and with no predators 它们搭乘来访的船只来到岛上 由于缺乏天敌控制

250. millions of red crabs haven't managed to reach the sea.
     数以百万的红蟹未能成功抵达海洋
251. An invader has occupied this island.
     一种入侵物种占领了这座岛屿
252. Yellow crazy ants.
     黄疯蚁
253. They escape from visiting ships, and with no predators
     它们搭乘来访的船只来到岛上 由于缺乏天敌控制
254. to control them, they have now created vast
     它们在森林里建立了
255. super colonies in the forest.
     巨大的超级蚁群
256. When migrating red crabs march into their territory,
     当迁徙的红蟹经过它们的领地时

来自《行星地球 第二季 第一集 Planet Earth S02E01 岛屿》第 253 行