你们知道动物们为什么要迁徙吗？动物迁徙有好些原因：有的是因为季节变换，有的是因为食物短缺，还有的是因为环境破坏……总之，是因为这个地方已经不适宜它们生存了，所以才逼不得已要迁往下一个栖息地。
Do you know why animals migrate? There are many reasons for animal migration: some are due to seasonal changes, some are due to food shortages, and some are due to environmental damage... In short, it is because this place is no longer suitable for their survival, so they are forced to move to the next habitat.
你看，一大群大象正向我们走来，它们要去寻找水源充足的地方。领头的是一只母象，队伍中还有一头刚出生一天的小象，它们又渴又饿，很不幸，小象没能挺住，渴死了。它的尸体在炎热的阳光下都快被烤干了，母象们悲伤的将小象那干瘪的身体用鼻子卷起来，闻了闻，然后挖了一个坑，把小象的尸体埋了起来，随后继续前进。
You see, a large group of elephants are coming towards us, looking for a place with sufficient water sources. The leader is a female elephant, and there is also a newborn baby elephant in the team. They are both thirsty and hungry. Unfortunately, the baby elephant couldn't hold on and died of thirst. Its body was almost dried up in the hot sunshine. The mother elephants sadly rolled up the withered body of the baby elephant with their noses, sniffed it, dug a hole, buried the baby elephant's body, and then continued to move forward.
再看，成千上万只美洲瓣蹼鹬由于秋季来临，要飞往温暖的南方。它们从加拿大来，最远能飞到中美洲。这一路上，它们遇到了它们的死敌——白头海雕。白头海雕在海面上翱翔，死死盯住一只美洲瓣蹼鹬，等到时机成熟，便俯身一冲，用利爪迅速抓住猎物并带离水面。你以为这场猎杀那么快就结束了吗？不！只见白头海雕爪子一松，又把猎物放了。正当我奇怪之时，白头海雕一个俯冲，又把那可怜的美洲瓣蹼鹬抓了起来。就这样，它反复了7次，才开始美美的享受大餐。在这之中，不知道有多少美洲瓣蹼鹬葬身在白头海雕的利爪之下。
Looking at it again, thousands of American webbed sandpipers are flying to the warm south due to the arrival of autumn. They come from Canada and can fly as far as Central America. On this journey, they encountered their archenemy - the bald eagle. The bald eagle soars on the sea surface, keeping a close eye on a sandpiper with American petals. When the time is right, it bends down and charges forward, quickly catching its prey with its claws and taking it away from the water surface. Do you think this hunt will end so soon? no I saw the bald eagle release its claws and release its prey. Just as I was wondering, the bald eagle swooped down and caught the poor American webbed sandpiper again. So, it repeated 7 times before starting to enjoy the delicious meal. Among them, it is unknown how many American webbed sandpipers perished under the claws of the bald eagle.
每逢动物大迁徙，它们都要历经磨难、九死一生。但是它们为了后代的繁衍和自己的生存，即使困难再多、再大，也要走下去！
Every time there is a major animal migration, they have to go through hardships and die for a lifetime. But for the reproduction of their offspring and their own survival, even if the difficulties are many and great, they still have to keep going!