Here is an interesting paper. They used CT scanning to investigate the respiratory system of the alligator. They found many similarities with birds and suggest the form of the respiratory apparatus may be plesiomorphic for archosaurs.
Sanders and Farmer. 2012. The Pulmonary Anatomy of Alligator mississippiensis and Its Similarity to the Avian Respiratory System. The Anatomical Record DOI: 10.1002/ar.22427.
http://onlinelibrary.wiley.com/doi/10.1002/ar.22427/abstract
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