The following evolutionary adaptation study article is titled "Urban bird behavior may divide a species." I'm waiting for the same thing to happen to humans, if it hasn't already.
Researchers studied 168 blackbirds along a 2800-kilometer path in and around seven cities from Spain to Estonia. When blackbirds eat and drink throughout Europe, different a
Meanwhile, their forest-dwelling counterparts still take to the wing each year for warmer climes, traveling to southern Europe or as far as northern Africa, the team reports online this month in Oikos. Cities tend to stay warmer than the countryside and there's lots of food within easy reach -- factors that may keep urban birds lazing about town. The migratory divide could explain genetic differences that have already arisen among the urban and rural blackbird populations -- a possible first step to a species split."
Posted by Kathy Meeh