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Smaller birds are evolving faster than their larger counterparts, which may be key to predict species' ability to adapt to climate change.

United statesDavid willardMarketa zimovaVitek jirinexSean gieryProceedings of the national academy sciencesUs geologicalChicago field museumEcology research centerPennsylvania state universityUniversity of michiganUm school for environmentAppalachian state universitySouth americaSouth americanBenjamin winger