Ruben J, Dal Sasso C, Geist N, Hillenius W, Jones T, Signore M. 1999. Pulmonary function and metabolic physiology of theropod dinosaurs. The position of the colon in the dinosaur is similar to that of crocodiles and mammals, not birds. This position suggests that the dinosaur did not have abdominal air sacs, such as modern birds have. The location of the liver is the same as that of the crocodiles and effectively divides the chest from the abdomen.
Researchers also believe they have evidence of diaphragm muscles.
This dinosaur is the second genus to be reported with a diaphragm so the authors conclude that diaphragms were probably common in dinosaurs. Evidence continues to mount against the dino-bird link that the media promotes. Geology Pope K, Ocampo A, Fischer A, Alvarez W, Fouke B, Webster C, Vega F, Smit J, Fritsche A, Claeys P. 1999. Chicxulub impact ejecta from Albion Island, Belize. The authors suggest that ejecta deposited considerable distance from the impact is significantly affected by the atmosphere.