Before they evolved the ability to fly, two-legged dinosaurs may have begun to flap their wings as a passive effect of running along the ground.
from All Top News -- ScienceDaily https://www.sciencedaily.com/releases/2019/05/190502143530.htm
from All Top News -- ScienceDaily https://www.sciencedaily.com/releases/2019/05/190502143530.htm
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