Birds avoid noise

Researchers from Boise State University in Idaho created a “phantom road” at a site in the Boise Foothills that is a stopover for migratory birds in the fall. They put up 15 speakers in Douglas fir trees and played recorded sounds of a road at intervals of four days — four days on, four days off. They then counted birds at three locations along their phantom road and three locations nearby where the road noises couldn’t be heard.
“When the noise was on,” they write, “fewer birds were present near the phantom road.” Bird abundance declined by more than a quarter near the make-believe road, and two species — thecedar waxwing and yellow warbler — almost completely avoided it. Only one species, theCassin’s finch, was more likely to be seen near the phantom road than in the quiet areas. 
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https://www.sciencenews.org/blog/wild-things/birds-avoid-sounds-roads