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Tree swallow or purple Martin

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6 minutes ago, Jefferson Shank said:

Yes, it is a male Tree Swallow.

Since we can only see blue-green upperparts in this photo, sex cannot be determined. We can reliably assess sex only through the presence of a cloacal protuberance (which makes it a male) or a brood patch (which makes it a female). An exception is that some Tree Swallows can be sexed by wing chord length.

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