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Tree Swallows are unique in that first-year females, although reproductively mature, have a different plumage from older birds. This plumage is similar to the juvenile plumage--non-iridescent brownish-gray above with a grayish-white belly. Juveniles have a grayish breast-band that first-year females lack.(Birdweb)
Spotted at Spencer Island. Tree Swallows are usually found near water. They require nest cavities, either natural or man-made. Often these cavities are situated over or immediately adjacent to water.