, are small handsome songbirds clad in soft grey with bold black and white stripes on their heads. They are a well-studied model organism that have contributed to literally tens of thousands of studies on learning, communication and signal evolution.
was recorded in urban areas of San Francisco and Richmond ) as well as in nearby, more rural areas ) before and during the recent statewide COVID-19 shutdown. Numbers denote locations where songs were also recorded. Photograph of a male white-crowned sparrow singing on his territory . Spectrograms of the four song dialects, Drake, Clear, San Francisco, and Berkeley, with numbers corresponding to their respective occurrence at sampling locations depicted in .
They found that as background rumble of vehicles fell off, the sparrows sang 30% more quietly, on average, than in earlier years and their songs could be heard twice as far away as in earlier years, when the sparrows were shouting their heads off. Professor Derryberry and her collaborators did find the sparrows were less aggressive overall, which is consistent with Dr Phillips’ earlier study that found that urban birds are quicker to attack their rivals . Perhaps the sparrows were less likely to fight when they could actually hear each other’s songs?
This study shows how quickly some bird species can adapt to a rapidly changing environment by changing their behaviors.
Nature is really benefiting from this pandemic. I’m amazed, when people are on lockdown, how fast animals take over the neighborhood.
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