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Popular Science Monthly/Volume 33/June 1888/Whistles Ancient and Modern - Wikisource, the free online library
![Dolphins use signature whistles to represent other dolphins – similarly to how humans use names - Raw Story - Celebrating 19 Years of Independent Journalism Dolphins use signature whistles to represent other dolphins – similarly to how humans use names - Raw Story - Celebrating 19 Years of Independent Journalism](https://www.rawstory.com/media-library/struggling-hong-kong-theme-park-to-end-dolphin-shows.png?id=24836488&width=400&height=215)
Dolphins use signature whistles to represent other dolphins – similarly to how humans use names - Raw Story - Celebrating 19 Years of Independent Journalism
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Whistle Museum – A web site dedicated to whistles, research and collecting whistles. by Avner Strauss
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