Ledgers recording physique measurement measurements, measuring instruments and a Tennessee Warbler belonging to Discipline Museum scientist, Dave Willard, who took measurements of 70,716 chicken specimens of migratory birds that died in collisions with buildings in Chicago over a interval of about 4 a long time are pictured on this picture launched on December 4, 2019. Discipline Museum/Kate Golembiewski/ Handout by way of REUTERS

WASHINGTON (Reuters) – Since 1978, researchers have scooped up and measured tens of hundreds of birds that died after crashing into buildings in Chicago throughout spring and fall migrations. Their work has documented what may be known as the unbelievable…



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