Kevin Stubbs, a biologist from the U.S. Fish and Wildlife Service, and Tonya Dunn, a biologist from the U.S. Army Corps of Engineers Tulsa District, mark Interior Least Tern populations and locations in a fan boat on the Arkansas River. The biologists covered 64 miles of river counting fledglings.

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Photo by: Brannen Parrish |  VIRIN: 140813-A-PO406-001.JPG