- whose ancestors once roamed on land.
它的祖先曾遍布陆地 - Whales, bigger than any other animals that have ever lived.
鲸鱼是史上最大的动物 - Birds,
鸟类 - the last survivors of the dinosaurs...
是恐龙时代的最后幸存者 - the world's greatest dynasty.
那曾是世界上最伟大的王朝 - All predators,
都是捕食者 - all hunting the same prey,
都在捕猎相同的猎物