Posted by Edwin Bowe on October 30, 2021 at 3:42 pm
Location: Lamar Valley, Yellowstone National Park, Montana USA
This image demonstrates two features that may be used to differentiate male Barrow’s goldeneyes from male common goldeneyes. First, the white patch behind the bill in a Barrow’s goldeneye is crescent-shaped, as opposed to being round in a common goldeneye. Second, a black “spur” is present on the side of a Barrow’s goldeneye that is absent on a common goldeneye.