Tree Swallow 6/11/18

Tree Swallows, sometimes called White-bellied Swallows, arrive in April from southernmost parts of North America, the Caribbean, and northern Central America while other North American Swallows winter farther south. Males are an iridescent blue-green on their uppersides and white below, while females are browner above with just hints of blue-green iridescence. As females age they become more colorful and iridescent like the males. They’re found near open fields and wetlands and nest in tree cavities but take readily take to nest boxes like this one. ¬†They raise their young on insects caught on the wing, but if caught by a cold snap early in the season, they can supplement their diet with berries.

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