City Sparrows Sing Louder to Trump Cars
Pitches are higher today than decades ago: Study
By John Johnson,  Newser Staff
Posted Apr 10, 2012 2:38 PM CDT
Sparrows have raised their pitch, apparently to be heard above the sounds of traffic.   (Flickr)

(Newser) – 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.