Tachycineta bicolor HOW TO IDENTIFY: * Length: 5 inches * Tiny bill * Iridiscent blue-green upperparts * White underparts * Forked tail * Female duller than male * Juvenile dull brown above and may have hint of a gray breast band * Most often seen flying * Nests in cavities near water * Often found in large flocks Similar species: The Tree Swallow is most similar to the Violet-green Swallow. The Violet-green Swallow has white patches that extend further onto the sides of the rump, a white area that extends behind and over the eye and greener upperparts. Bank and Northern Rough-winged Swallows look similar, especially in Fall. Bank Swallow is smaller, this feature is especially noticeable as mixed flocks of swallows often sit on telephone wires. Bank has a dark breast band that is lacking or indistinct in the Tree. From above, Bank Swallow has a paler rump that contrasts with the darker back and tail where the Tree Swallow is uniformly-colored. Northern Rough-winged Swallow has a dusky throat and warmer brown upperparts than the Tree Swallow. Swallows often call in flight and these calls are excellent clues to identification.
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