Anatomy, ontogeny, and evolution of the archosaurian respiratory system: a case study on Alligator mississippiensis and Struthio camelus

Emma Schachner, Brandon Hedrick, Heather Richbourg, John Hutchinson & CG Farmer
The avian lung is highly specialized and is both functionally and morphologically distinct from that of their closest extant relatives, the crocodilians. It is highly partitioned, with a unidirectionally ventilated and immobilized gas-exchanging lung, and fully decoupled, compliant, poorly vascularized ventilatory air-sacs. To understand the evolutionary history of the archosaurian (birds, crocodilians and their common ancestors) respiratory system, it is essential to determine which anatomical characteristics are shared between birds and crocodilians and the role...
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These counts follow the COUNTER Code of Practice, meaning that Internet robots and repeats within a certain time frame are excluded.
What does this mean?