TED · B1-B2
These animals can hear everything - Jakob Christensen-Dalsgaard
本文探讨了动物界非凡的听觉适应能力。从猫头鹰利用面部结构捕捉微弱声响，到昆虫和鲸类在超声波与次声波领域的极端感知，文章揭示了不同物种如何通过独特的生理构造突破人类听觉极限，感知声音世界的广阔频谱。
猫头鹰的精准捕猎机制
Owls, however, have some workarounds. Our external ears funnel sounds inward—but many owls use their whole faces to do this. Their ears, hidden beneath a flap of feathers, have eardrums proportionally much larger and more sensitive than humans’.
And because many owls ears are positioned asymmetrically, sound waves reach them at different times. This slight delay helps their brains determine the direction of the sound’s source.
高频声波的探测与应用
Lots of different features also help animal ears hit especially high notes, like the extra hard, stiff middle ear bones of toothed whales; like dolphins and sperm whales, which efficiently propagate high frequency vibrations. Indeed, some toothed whales and bats emit sound pulses around 200,000 hertz and listen for the reflections.
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