That article about all #birds in North & South America having shrinking bodies & lengthening wings due to #ClimateChange is likely rapid #evolution in response to external stimuli - warming temps. Per the USAToday article, small bodies handle heat better; longer wings to keep migrating w/ less energy.
When local food is sparse, body size also shrinks. Longer wings = can search farther for food. Could be more than 1 reason & that one is a daily requirement - eating.
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