Have swallows evolved shorter wingspans to avoid cars?

A new study by biologists at the University of Tulsa and the University of Nebraska at Lincoln presents evidence to suggest that cliff swallows in southwestern Nebraska may be suffering fewer incidence of collision with cars, thanks to shorter wings. According to Current Biology, researchers Charles Brown and Mary Bomberger Brown have been paying close attention to the swallow population in this particular section of Nebraska. They've found that the birds measured now have shorter wings than did the birds that were first studied back in 1982.

Autoblog , Have swallows evolved shorter wingspans to avoid cars?, Have swallows evolved shorter wingspans to avoid cars?