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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. Birds have a breathing system that is unique among land animals.

Rio coloradoUnited statesJeffrey wilsonPaul serenoUniversity of michiganUniversity of chicagoNational geographicNational geographic explorer in residenceAvian intrathoracic air sacsNew predatory dinosaurAerosteon riocoloradensis