Have Nebraskan Swallows Evolved Shorter Wingspans To Avoid Becoming Roadkill?

A 2005 study by the U.S. Dept. of Agriculture Forest Service revealed that over 80 million birds are killed each year due to collisions with motor vehicles. However, one smart bird species that resides in some areas of the Midwestern United States like Nebraska, seems to be bucking the trend and if two researchers are to be believed, it is all to do with evolution.