Data from: Unidirectional pulmonary airflow patterns in the savannah monitor lizard

Emma R. Schachner, Robert L. Cieri, James P. Butler & C. G. Farmer
The unidirectional airflow patterns in the lungs of birds have long been considered a unique and specialized trait associated with the oxygen demands of their volant lifestyle, endothermic metabolism and unusual pulmonary architecture; however, the discovery of similar flow patterns in the lungs of crocodilians indicates that this character is likely ancestral for all archosaurs, the group that includes extant birds and crocodilians as well as their extinct relatives, such as pterosaurs and dinosaurs. Unidirectional...
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