Since 1978, researchers have scooped up and measured tens of thousands of birds ...
Ledgers recording body size measurements, measuring tools and a Tennessee Warbler belonging to Field Museum scientist, Dave Willard, who took measurements of 70,716 bird specimens of migratory birds that died in collisions with buildings in Chicago over a period of about four decades are pictured in this photo released on December 4, 2019. Field Museum/Kate Golembiewski/ Handout via REUTERS
A study published on Wednesday involving 70,716 birds killed from 1978 through 2016 in such collisions in the third-largest U.S. city found that their average body sizes steadily declined over that time, though their wingspans increased. The study focused on 52 species - mostly songbirds dominated by various sparrows, warblers and thrushes - that breed in cold regions of North America and spend their winters in locations south of Chicago. The researchers measured and weighed a parade of birds that crashed into building windows and went splat onto the ground.
“In other words, climate change seems to be changing both the size and shape of these species,” said biologist Brian Weeks of the University of Michigan’s School for Environment and Sustainability, lead author of the study published in the journal Ecology Letters.
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