Thanks to @bradbrubaker for the pointer to the Yellowstone sound library! Samples from https://www.nps.gov/yell/learn/photosmultimedia/soundlibrary.htm:

- Ruffed grouse (kick drum)
- Bull elk antler battle (rimshot)
- Bison rut
- Bull elk bugling
- Boreal chorus frogs
- Spadefoot toad
- Fountain Paint Pot (background rumble)

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