A horse’s neigh may be unique in the animal kingdom. Now scientists know how they do it - AP News

1. A horse’s neigh may be unique in the animal kingdom. Now scientists know how they do it  AP News
2. How a Horse Whinnies: With a Whistle and a Song  The New York Times
3. Scientists Discover Horses Can Whistle and Sing at the Same Time  SciTechDaily
4. When horses whinny they 'sing' and 'whistle' at the same time  Australian Broadcasting Corporation
5. A horse's whinny is unlike any other sound in nature  New Scientist

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