The Rocky Mountain National Park Sound Library was released online earlier this week.
From Estes Park News:
This extensive acoustic catalog contains over 210 recordings of more than 60 bird species, natural soundscapes, and wildlife vocalizations including elk, coyotes, western chorus frogs and even a pine squirrel. All the recordings were collected in the park by Dr. Jacob Job, a researcher with Colorado State University and the NPS Natural Sounds & Night Skies Division.
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Resources
Direct to Rocky Mountain National Park Sound Library
Direct to NPS Natural Sounds & Night Skies Division
See Also: Yellowstone National Park Sound Library
See Also: National Park Service Sound Gallery