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Re: Dinosaur heart found?

In a message dated 4/20/00 3:14:26 PM EST, jhecht@world.std.com writes:

<< The heart shows a single aorta, like birds but unlike the 
 dual aortas of modern crocodiles, consistent with the belief that 
 dinosaurs were active animals. >>

Note: Shape of heart indicates high activity level of animals, but does not 
necessarily indicate whether animals were endo- or ectothermic. High activity 
level follows from perfect blood aeration (and separation of low-pressure 
pulmonary circulation from high-pressure systemic circulation), but 
endothermy (mentioned in other posts) is not necessary for high activity