Chimney Swift migration has arrived in Crown Heights - Brooklynian

Chimney Swift migration has arrived in Crown Heights

Hey has anyone else noticed the chirping dark little birds darting in the sky around New York Ave and Park Place?

http://animals.nationalgeographic.com/animals/birding/chimney-swift/
http://www.chimneyswifts.org/

Or am I mistaken about what they are?image
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