Migratory birds in North America are shrinking as their wings get bigger. Climate change is to blame.

North American migratory birds are becoming smaller as the planet warms due to climate change, a new study finds. Researchers from the University of California, Los Angeles (UCLA) examined more than 30 years of data for adult male birds across 105 avian species that migrate through North America. They found that between 1989 and 2018 […]