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In the lab, three alligators were put on motorized treadmills and X-ray videos were made. Marissa's Foot Show 2. As wings move through the air, this curling action causes spirals vortices of air see photo of continuous vortices to the right which can disrupt the smooth flow of air over a wing and reduce lift. Notice the trough formed in the clouds. Abbreviations: cov, covert feathers; prt, pretibial feathers; pst, shafts of post-tibial feathers; pub, pubis; ti, tibia Longrich In other words a bird with short, broad wings, like a vulture, won't miss a few feathers as much as one with long, narrow wings, like an albatross. Although other dinosaurs may have possessed integumentary structures with insulatory qualities, current evidence suggests that these evolved only in coelurosaurs.

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