A mass of birds died in Chicago in October after striking one building, adding to the push for more protections in one of the most dangerous cities for avian migration. A mass of birds died in Chicago in October after striking one building, adding to the push for more protections in one of the most dangerous cities for avian migration. Birds, Animal Migration, Museums, Wildlife Die-Offs, Windows, Birdwatching, Environment, Cornell Laboratory of Ornithology, Field Museum, Frontiers in Ecology and the Environment (Journal), University of Illinois, Urbana-Champaign, Farnsworth, Andrew, Chicago (Ill), Cook County (Ill), Illinois, Lake Michigan, United States NYT > Science
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