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Researchers at the University of Nebraska said a species of birds evolved to avoid becoming road kill.

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!!!SwallowWingSpan1.

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http://on.aol.com/video/swallow-wing-span-evolves-over-30-years-517871648?hp=1&playlist=127170&icid=maing-grid7|myaol|dl24|sec1_lnk3%26pLid%3D349991

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