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Re: The Right-to-Left Shunt of Crocodilians Serves Digestion

Birds have lost the shunt capability present in crocodiles and reptiles (including snakes, some of which can eat meals bigger than their body weight). Where did T. rex and the other supergiant predatory dinosaurs fit on the scale?

Right in the place where Napoleon crossed the Mississippi, I'm afraid.

Crocodiles have a unique valve between the aorta and... some other blood vessel, _outside_ the heart, and a heart with four completely separated chambers. Extant non-archosaurian sauropsids have three-chambered hearts (with incomplete, sometimes almost complete, partitioning of the main chamber). These two conditions are evidently not homologous.