BBC | 《南太平洋》- 漂流者 25
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Hawaii's 20 surviving species of honeycreeper also evolved from just a few individuals
夏威夷20种生存下来的蜜旋木雀也是从仅仅几只进化而成的
Compared to seabirds,
跟海鸟比较起来
honeycreepers are poor fliers
蜜旋木雀不是很好的飞行者
So how did the ancestors of these forest birds and Hawaii's other castaways get here?
那这些森林鸟的祖先和夏威夷其他的流浪者又是如何来到这里的呢？
The answer may be blowing in the wind
答案或许就在风中
Even the gentlest breeze can have a huge impact
即使是最轻微的风也能产生巨大的影响
Tree ferns stir and release their lightweight spores
树蕨轻轻拂动释放它们轻量级的孢子
Thermal updrafts can carry the spores 30,000 feet into the jet stream
上升暖气流能将孢子带到三万英里高的高速气流中
And there are even animals designed to ride these high-altitude air currents
甚至还有一些动物也适合搭乘这些高空气流
Near-weightless spiderlings are expert ballooners,
几乎没有重量的幼蛛是乘气球的好手
catching the wind with their gossamer threads
它们用蜘蛛网来纲住风
Like spores,they, too, can hitch a ride on the jet stream
像孢子一样，它们也能搭上高速气流的便车
Enduring temperatures of minus 30 degrees centigrade,
忍受着摄氏零下30度的气温
a spider can cross the breadth of the Pacific in a matter of days
一只蜘蛛在几天内就能横跨广阔的太平洋
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