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Wild ass are the most conspicuous pioneers of this high frontier,
野驢是高原邊疆上最明顯的拓荒者，
but the most numerous grazer in Tibet lives underground.
但數(shù)量最為可觀的食草動物卻深藏在地下。
Pika, a relative of the rabbit. It, too, feeds on grass.
鼠兔，兔子的親戚。和兔子一樣以草為食。
On the exposed plateau, pikas never stray far from their burrows.
在毫無遮擋的草原上，鼠兔從不敢遠離自己的洞穴。
But even so, squatters will move in given half a chance.
可是盡管如此，鼠兔的洞穴還是經(jīng)常被其它動物霸占。
While ground peckers and snow finches can be a nuisance,
然而盡管蟻鴷和雪雀鳩占雀巢的行為確實很討厭，
they're worth tolerating because they provide a valuable early warning system.
它們還是值得忍受的，它們可以在危險來臨之前給鼠兔預(yù)先的警告。
The bizarre Tibetan fox. The pika's nemesis.
長相怪異的藏狐。鼠兔的災(zāi)星。
When stalking, it keeps below the skyline, perhaps helped by its curious body shape.
在躡手躡腳地潛近獵物時，藏狐能保持特別低的姿勢，可能其古怪的體型起了一定的作用。
But why the square head?
但是為什么是方形的頭呢？
