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Common Merganser (Mergus merganser)
Copyright © 2009, Antonio J. Quezon

Common Merganser (Mergus merganser)

Madison River, Madison, Yellowstone National Park, Wyoming, U.S.A., September 28, 2009
Canon EOS-1D Mark II N, Focal length = 500 mm, Equivalent ISO = 400, Exposure = 1/640 s, f/8