And you have lemmings...that’s a nest indicating that lemmings are reserved...somewhat abundant.

还有旅鼠...这一个巢表明是有旅鼠的...量有点儿大。

Almost everything they eat is the brown lemming here.

它们吃的几乎都是棕色的旅鼠。

Lemmings periodically commit mass suicide, and no one knows just why!

旅鼠会周期性地进行大规模自杀，但是没人知道究竟是为什么！

The lemming relies on the snow to hide.

旅鼠要依赖雪藏身。

Despite occasionally congregating in huge numbers the lemming prefers a solitary life style.

除了偶尔大量聚集以外旅鼠更喜欢独居生活。

Other sequences come from land animals, including caribou, hares, mastodons, geese, lemmings and ants.

自陆地动物，包括驯鹿、野兔、乳齿象、鹅、旅鼠和蚂蚁。

The DNA also showed the presence of animals including geese, hares, reindeer and lemmings.

DNA还显示了鹅、野兔、驯鹿和旅鼠等动物的存在。

The lemming is one such animal.

旅鼠就是这样一种动物。

After just five weeks, these pups will be weaned and they will mostly eat lemmings.

仅仅五周后，这些幼崽就能断奶转而以旅鼠为主食。

For lemmings, small fussy rodents, there is no place more comfortable than the Arctic tundra.

对于旅鼠这种小而挑剔的啮齿类动物说，没有比北极苔原更舒适的地方了。

Strong stomach acid digests the flesh, but the bones and furs of the lemmings are regurgitated.

强烈的胃酸消化着鼠肉，但是旅鼠的骨骼和毛被反刍出。

With so many arctic foxes on the tundra, it's easy to see what is happening to all the lemmings.

苔原上出现这么多的北极狐，等待着旅鼠们的是什么就显而易见了。

Lemmings. They breed at an astonishing rate. This female give birth to two litters during the winter.

旅鼠，它们以惊人的速度进行繁殖。这只雌性一个冬天就已生了两窝幼鼠。

But their numbers have fallen recently as has been the number of lemmings.

但它们的数量最近有所下降，旅鼠的数量也有所下降。

Upon reaching the coast, the lemmings do not stop but swim by the thousands into the surf.

到达海岸后，旅鼠们并不会就此止步，而是数千只鼠一起游进海浪里。

The lemmings eat everything in their path, continuing their destructive march until they reach the sea.

旅鼠会把路上所有的东西都吃掉，一直继续着它们破坏性的行进直到到达海边为止。

So there is lemmings here... so good side you have...seven eggs or five chicks or two eggs right now.

这里有旅鼠，你的很是时候，现在有七个蛋… 五只雏鸟，两个蛋。

When their food supply is sufficiently large, the lemmings live a normal, undisturbed life.

当它们的食物供应充足的时候，旅鼠们过着平常、不受侵扰的生活。

The lemmings leave their nests all together at the same time, forming huge crowds.

旅鼠会在同一时间一起离开它们的巢穴，组成巨大的迁徙群体。

However, when the lemmings' food supply becomes too low to support the population, a singular migration commences.

但是，当它们的食物供应少到无法喂饱整个族群时，一次非凡的迁徙就开始了。