Mystery Bird: Tree Swallow, Tachycineta bicolor

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[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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