These bird brains are really smart - NCPA

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USA TODAY TUESDAY, MARCH 19, 2013

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Cliff swallows adapt to avoid death by traffic Cathy Payne

@cathyapayne USA TODAY

Does a new study offer a bird’s-eye view into evolution? Fewer cliff swallows are being killed by moving vehicles because of evolution, suggests a study published Monday in the journal Current Biology. “These birds have been exposed to vehicles and roads for 30-plus years,” says Charles Brown, the study’s lead author. “During that time, they have evolved to avoid being killed by traffic. Evolution can happen very rapidly, and some animals can adapt to urban environments very rapidly.” The decrease in road deaths is likely because the birds have shorter wingspans, which makes them more agile fliers, or they are learning to avoid vehicles, Brown says. In the western USA, cliff swallows, which live in colonies, have nests around highway bridges, overpasses and road culverts. They sit on roads to pick up gravel for their gizzards to

CHARLES R. BROWN

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