Trailcam check, bluebirds, bison and Mercury: Mountain Bluebird, Custer State Park, May 2016. [#8380-4200] Click on image for next photo. This image available for licensing through: iStock by Getty Images.

Mountain Bluebird, Custer State Park, May 2016.  Click for next photo.

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All photos 1998-2019 by Thomas O'Neil