Pigeon Power (IMAGE) University of Iowa Caption In a new study from the University of Iowa, researchers found that pigeons can categorize and name both natural and manmade objects -- and not just a few objects. These birds categorized 128 photographs into 16 categories, and they did so simultaneously. Credit Illustration by John Petsel (B.F.A. '15 in graphic design). 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.