Song bird Evolution

Hello world,
Evolution is popping up in North American songbirds. The reason that they're evolving is that their habitats are becoming fragmented and they need to fly longer distances to find a mate. Pointy tipped wings are best for long distance travel, and birds with these wings are showin up more often in fragmented habitats, while birds with rounder wings, which provide more manuverability, are more concentrated in reforested areas. This was discovered by looking at the wings of birds in a longterm exhibit. I don't find this surprising, since lots of other animals are adapting to human interferences. This is good, because it improves the chances that the songbird species will be able to survive in the long run.
Here's the link;
http://news.discovery.com/animals/songbirds-wings-shape.html
Knights and away!