Furthermore, an avian system would only need a lung volume of about 600 liters while a mammalian one would have required about 2,950 liters, which would exceed the estimated 1,700 liters of space available in a 30-ton Apatosaurus′ chest.
Ademais, un sistema aviario necesitaría só un volume pulmonar duns 600 litros mentres que un de mamífero requiriría uns 2 950 litros, o que excedería os 1 700 litros estimados de espazo dispoñible no peito dun Apatosaurus′ de 30 toneladas.