Welcome to the Yellowstone sound library, where you can immerse yourself in the aural landscape of America’s first national park. The files available here were recorded in the park and are in the public domain.
(quote taken from the landing page)
https://www.nps.gov/yell/learn/photosmultimedia/soundlibrary.htm
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Help!! Lately my OT makes strange roaring sounds and even chirps sometimes! What do I need to feed him?