Almost 40 years of data reveal that, due to climate change, North America’s migratory birds are shrinking whilst their wings are growing longer
, an enormous building overlooking Chicago’s lakefront, is the largest and most flexible use convention center in North America. Conveniently located in walking distance from the Field Museum, its vast windows are a conspicuous killer of migratory birds.
They rescued and rehabbed the few individuals that were still alive, but for nearly all of the birds, it was too late. Chicago’s glass buildings had done their deadly job. The volunteers ended up collecting so many dead birds between 1978 and 2016 that these specimens now comprise as much as 20% of the museum’s bird collections.... [+]Dr.
Between 1978 and 2016, the birds’ body sizes gradually decreased. For example, 49 of 52 species of birds lost an average of 2.6% of their body mass, and their lower leg bone length decreased by 2.4% across species . Surprisingly, 40 of 52 of the bird species’ wingspans). Further, the researchers found that species with the fastest declines in leg bone length also showed the most rapid gains in wing length.
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