Please excuse my naivety, but is it possible that Pterosaur lungs were arranged radically differently from those of birds and other dinosaurs? When I look at pterosaurs.net's skeletal reconstruction of _Quetzalcoatlus_ (http://www.pterosaurs.net/Quetzalcoatlus.html) I can't help thinking that all that neck space is wasted if they are built at all like modern animals. But what if the lungs were partly in the neck itself? Or less radically, perhaps the tubing from the mouth to the lungs proper could absorb some of the oxygen en route?