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bats day flight

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From: diana regan
chicago, IL
near midway airport and oak lawn, i notice the same bird /bat like sounding animal flying around during the day. It makes a high pitched squeak as it it a bat or swallow? I don't notice the 2 tails though.

Extension Message
From: Laura Kammin
Visiting Extension Specialist, Pollution Prevention
Extension-Illinois-Indiana Sea Grant College Program
I'm guessing that you are seeing chimney swifts. They make a very high-pitched chattering noise, they are fairly small, and their flight pattern does sort of seem bat-like.

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