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Science

+ - Roadkill Forcing Cliff Swallows to Evolve->

Submitted by sciencehabit
sciencehabit writes: Cliff swallows that build nests that dangle precariously from highway overpasses have a lower chance of becoming roadkill than in years past thanks to a shorter wingspan that lets them dodge oncoming traffic. That's the conclusion of a new study based on 3 decades of data collected on one population of the birds. The results suggest that shorter wingspan has been selected for over this time period because of the evolutionary pressure put on the population by cars.
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Roadkill Forcing Cliff Swallows to Evolve

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