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The rain may be long gone, but there is water here...
雨季也許早已過去，但沙漠里還是有水...
locked away within the tissues of specialist desert plants.
只是儲存在沙生植物特化的組織當中。
Cacti are unique to American deserts.
仙人掌是美國沙漠中獨一無二的植物。
They all hoard water,
它們肥碩的莖干，
storing it in swollen stems and protecting it behind a barricade of spines.
有儲水功能，葉片特化成刺以防止水分散失。
They're so successful that they dominate these deserts.
這套策略成功地讓它們主宰著這片沙漠。
But this forest of spikes can cause problems for the animals that live here.
但這片尖刺叢林也給居住在此的動物們帶來了很多麻煩。
A Harris' Hawk. It has developed special techniques for hunting amongst the cacti.
一只栗翅鷹。它練就了在仙人掌林捕食的特殊技能。
Ground squirrels. Prey.
這是地松鼠。栗翅鷹的獵物。
At the first sign of danger, they bolt for the safety of the thorns.
當發現危險信號時，地松鼠們迅速躲進刺叢中避險。
But the hawks have a tactic to flush them out.
但栗翅鷹有法子逼它們出來
These are the only birds of prey that hunt in packs.
栗翅鷹是唯一成群捕食的猛禽。
Flying in formation, they try to drive their quarry into the open.
它們編隊飛行，將獵物驅趕到開闊地帶。
But this squirrel is staying put.
但這只地松鼠按兵不動。
So now the hawks continue the hunt... on foot.
栗翅鷹開始改變策略，轉為地面追擊。
They're closing in from all sides.
它們從四面八方逐漸逼近。
Soon, all escape routes are cut off. The squirrel is trapped.
很快封鎖了所有的逃跑路線。地松鼠陷入絕境。
