We’ve lost almost 3 billion birds in the U.S. and Canada since 1970

Popular Science | 9/20/2019 | Staff
chrismpotts (Posted by) Level 3
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The ornithologists used breeding surveys for 529 species—comprising 76 percent of known species in the U.S. and Canada—to estimate the number of birds from 1970 to 2017. In addition to surveys, they also used migration data from radar stations, which can capture flocks of birds in addition to showing local weather. The researchers used a statistical analysis that helped smooth over variations in the different datasets and create a...
(Excerpt) Read more at: Popular Science
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