Black Hills and Badlands May 2019: Swallow trying to feed the chick inside the nest box, Custer State Park, May 2019. [#9844-9610] Click on image for next photo.

Swallow trying to feed the chick inside the nest box, Custer State Park, May 2019.  Click for next photo.

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All photos 1998-2019 by Thomas O'Neil