As the streets of San Francisco emptied out in the first months of the
pandemic <https://www.sciencealert.com/pandemic>, the city's male birds
began singing more softly and improving their vocal range, making them
"sexier" to females, according to a new study published Thursday.

https://www.sciencealert.com/sparrows-have-changed-behaviour-in-response-to-coronavirus-anthropaus
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