A nutria (Myocastor coypus) exhibiting an interesting feeding behavior. It gathers duckweed with its forelimbs, sweeping the tiny floating plants toward its mouth by the thousands.
Nutria were introduced to Oregon from South America in the 1930s as animals to be raised for their pelts but escaped captivity or were released when the scheme failed to be profitable. They are considered by the Oregon Dept. of Fish and Wildlife to be an unwanted invasive species, but they seem to be here to stay, and are found throughout the watershed.
Video taken by CSP board member Karl Lee, November 2016 at Westmoreland Park, Portland, OR.