The new death count is almost double some previous estimates.
A 2015studyfound that collisions with buildings accounted for 599 million bird deaths per year in the United States.
Wind turbines, in comparison, account for 570,000 bird deaths per year.
Collisions with buildings is one of the leading anthropogenic causes of bird deaths.© Steven Pisano via Flickr
A number of states and municipalities have enactedlawsrequiring buildings to be designed to be more bird-friendly.
Unfortunately, our work shows population-level declines are not something we can fix with rehabilitation.
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