FILE PHOTO: A hen is seen in a snow coated tree in Central Park throughout a pre-winter storm in New York Metropolis, U.S., December 9, 2017. REUTERS/Brendan McDermid/File Picture

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 could be known as the unimaginable shrinking hen.

A examine printed on Wednesday involving 70,716 birds killed from 1978 by 2016 in such collisions within the third-largest U.S. metropolis discovered that their common physique sizes steadily declined over that point, although…

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