In nature Horn (acoustic)

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male mole cricket in singing position in burrow. burrow shaped double exponential horn bulb.



acoustic horns found in nature in form of burrows constructed male mole crickets amplify song. gryllotalpa vineae digs smoothed burrow no irregularities larger 1 millimetre. song loud enough make ground vibrate; 3.5 milliwatts of mechanical power delivers peak of 92 decibels @ distance of 1 metre. song can heard 600 metres away.








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