OKLAHOMA — A helicopter prepares to land on the refueling platform after spraying one of the Interior Least Tern islands along the McClellan-Kerr Arkansas River Navigation System in Oklahoma. The Corps used an EPA-approved herbicide to spray the island for the bird, which prefers barren sandbars along river systems as habitat.

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Photo by: Nate Herring |  VIRIN: 120509-A-CE999-003.JPG