A Study Of 70,000 Birds From 52 North American Migratory Bird Specimen Is Indicating That The Body Size Of Birds Shrank By ~2.6% While Their Wingspan Length Grew ~1.3% During A 38-Year Period (1978 to 2016), As A Result Of Global Warming. Scientists Are Of The Opinion That These Changes May Be Adaptive To Maintain The Birds’ Lifestyle.
Birds are getting smaller. Scientists see the echo of climate change.
A separate study published in September in the journal Science found that human activities and ecological changes are already having a devastating impact on bird populations.