The forest of Amazonia and the urban canyons of Chicago are dramatically different environments. But in both, bird life has displayed the same mysterious pattern: while all birds are shrinking, small birds are getting smaller, faster, than larger ones, a new study has found. At the same time, in a surprising twist, their wings are getting longer — as though all birds were becoming a bit more every year like tree swallows — and scientists have no idea why. The findings published on Monday in Proceedings of the National Academy of Sciences begin with a large and macabre body of evidence. Since 1978, scientists at Chicago’s Field Museum have collected the corpses of unlucky bird
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