Rock Pigeons in Manhattan (IMAGE) University of Massachusetts Amherst Caption The largest analysis to date of urbanization effects on bird and plant species diversity worldwide four "cosmopolitan" bird species found in more than 80 percent of cities are the rock pigeon, house sparrow, starling and barn swallow. Credit NCEAS, Paige Warren Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.