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Perhaps the most important distinction between surface vibrations and sounds is that the former are largely ignored, including by scientists who study the senses. For the longest time, researchers saw all kinds of drumming, thumping, shaking, and quivering body parts, and interpreted them as visual or auditory signals, while ignoring the surface waves that those movements produce. Every red-eyed tree frog cues into that sensory world from four and a half days of age, but generations of scientists ignored it. “We have encountered it, but we were not looking for it,” wrote ecologist Peggy Hill. It’s a lesson that sensory biologists, and everyone else, should heed: By giving in to our preconceptions, we miss what might be right in front of us. And sometimes what we miss is breathtaking.
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