In this June 8, 2017 photo, Yellowstone National Park photographer Jim Peaco, left, gives Sunnyvale, Calif., tourists Amanda and Stephen Chou a lesson in shutter speeds while photographing harlequin ducks in the LeHardy Rapids section of the Yellowstone River in Yellowstone National Park, Wyo. From garbage truck driver to seasonal slide librarian in 1984, Peaco finally got a toehold on a dream job: Yellowstone National Park photographer. (Brett French/The Billings Gazette via AP)
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