bird-like lungs article http://www.evolutionpages.com/bird_lung.htm evidence say as did air-filled bones say say http://www.evolutionpages.com/bird_lung.htm http://www.evolutionpages.com/bird_lung.htm Theropod dinosaurs and birds linked by 'breathing' design http://www.evolutionpages.com/bird_lung.htm as did air-filled bones