On 24 August 2016, I found a large flock of Blue-winged Teal at the Dennison, Minnesota, sewage treatment ponds. The ducks circled the facility as I took photos. To my surprise, when I got home and worked on the images, I discovered that one of the ducks was not a Blue-winged Teal. The lowest bird in the center of the photo is actually a Green-winged Teal.
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