North American migratory songbirds’ bodies are getting smaller while their wingspans are growing larger, according to research on 70,716 birds that died after hitting buildings in Chicago from 1978 through 2016. Average body size across all 52 species studied decreased by 2.6% over the study period, and average wingspan increased by 1.3%, and the researchers attribute the change to global warming, according to findings published in Ecology Letters. Click on title above to open article (after clicking the box “not right now”)
