The Birdhouse Network Physical Description Male Tree Swallows can be identified by their glossy, iridescent, dark blue or blue-green plumage. Their cheeks and entire underparts are white. Adult females resemble the males but tend to be a little more greenish.
Juveniles are a dull gray brown.
The tail and wings are slate brown with a slight greenish tint. The belly and breast are white, and often the breast has a faint gray band. In winter, they migrate to Mexico, Florida, and Central America, but they occasionally winter as far north as the mid-Atlantic coast and the central valley of California. Tree Swallows prefer open habitats, such as the edges of woods, and areas near water, including marshes, shorelines, and swamps. Tree Swallows are quite tolerant of humans.