tags: Tree Swallow, Tachycineta bicolor, birds, mystery bird, bird ID quiz
[Mystery bird] Tree Swallow, Tachycineta bicolor, photographed at Lake Thompson in Kingsbury County, South Dakota. [I will identify this bird for you tomorrow]
Image: Terry Sohl, 2 May 2009 [larger view]
Photo taken with a Canon 50D, 400 5.6L.
Please name at least one field mark that supports your identification.
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Tree swallow, based on the coloring and the lack of white over the eye (which the violet-green would have). Pretty!