The remains of a 30-foot-long predatory dinosaur discovered along the banks of Argentina's Rio Colorado is helping to unravel how birds evolved their unusual breathing system. University of Michigan paleontologist Jeffrey Wilson was part of the team that made the discovery, to be published Sept. 29 in the online journal Public Library of Science ONE and announced at a news conference in Mendoza, Argentina. The discovery of this dinosaur builds on decades of paleontological research indicating that birds evolved from dinosaurs. Birds have a breathing system that is unique among land animals. Instead of lungs that expand, birds have a...