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Tachycineta bicolor
This swallow averages 13.5 cm long and weighs about 20 g. The bill is tiny. The adult Tree Swallow has iridescent blue-green upperparts, white underparts, and a very slightly forked tail. The female usually has duller colors than the male, often more greenish than the more bluish male.
Fisherville Brook Wildlife Refuge in Exeter, RI
Thanks to LennyWorthington for the ID confirmation!