俯冲猎鹰
Polly tries to copy a peregrine falcon's dive from El Capitan, learning how the falcon's third eyelid and nostril cones let it reach 380 km/h without injury.
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Keep it on your phone →波莉想了两天关于那只游隼。她想感受它俯冲的形态。
第三天早上,在游客停车场还没满之前,她去了酋长岩。她在一个高高的岩架上发现了一只游隼。这是一只雄鸟,比她和托马斯见过的雌鸟要小。背部是石板灰色,胸部有白色条纹。它正在吃东西。
她在五十米外的一根马桑树枝上栖息,等待着。
游隼吃完了。它在岩石上擦了擦喙,看了她一眼。然后它从岩架上迈出一步。
它没有拍动翅膀。它把翅膀收紧在身体两侧,就像叶子被拉进了茎里,然后俯冲而下。它加速了。两秒钟内,它就超过了悬崖的中部。然后它展开翅膀,转了个弯,消失在岩石后面。
一只游隼在俯冲时可以达到每小时380公里。这是地球上任何动物最快的运动速度。为了以这种速度俯冲而不受伤,游隼有第三层眼睑,可以遮住眼睛以挡风。它们的鼻孔里有小锥体,可以减缓空气进入肺部的速度。
波莉并不是为这种俯冲而生的。她知道这一点。但好奇心比理智更强烈。
她飞到岩架上,往下看。那几乎是垂直的落差。她把翅膀收紧在绿色的身体两侧。她向前倾斜。她掉了下去。
这不是游隼的俯冲。这是一只太过匆忙的鹦鹉。她摇晃着。风钻进了一只翅膀下。她调整了一下,偏离了路线,又调整了一下。二十米后,她展开翅膀,以一个松散、尴尬的弧线拉了出来。
她再次尝试,从更低的栖息处,小幅度地。然后再试,更低一些。到中午时,她已经进行了八次短暂的俯冲。没有一次是游隼的俯冲。但每一次都比上一次好一点。
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