Thread: CHICAGO | St. Regis Chicago (Vista) | 1,191 FT | 101 FLOORS
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  #20  
Old Posted Sep 20, 2019, 3:02 AM
LouisVanDerWright LouisVanDerWright is offline
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Join Date: Jul 2012
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Those are warblers. There's a zillion subspecies of them, they all migrate South around this time of year after mating in Northern States and Canada.
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