Science | sparrow City Sparrows Sing Louder to Trump Cars Pitches are higher today than decades ago: Study By John Johnson Posted Apr 10, 2012 2:38 PM CDT Copied Sparrows have raised their pitch, apparently to be heard above the sounds of traffic. (Flickr) Sparrows who live in the big city have learned to speak up in order to be heard: Researchers examined the songs of those that live around the Golden Gate Bridge and found that the calls are in a higher pitch now than they were in 1965, according to an Animal Behavior study noted by Scientific American. Researchers suspect the sparrows have adapted in order to be heard above all that traffic. Read These Next One wrong step costs teen at Yellowstone. An arrest has been made in the Devil's Den murders. Suspect in killing of hikers was arrested during a haircut. A Virginia politician was set on fire at his office. Report an error