Re: What is an "active ectotherm"?

[jonest@ava.bcc.orst.edu (Terry D. Jones)]

George Olshevsky wrote:

>It seems perfectly clear to me that endothermy did not develop overnight.
>Since it seems to be an intricate kind of physiology, it surely evolved in
>stages, over quite a few millions of years. Perhaps active ectothermic
>dinosaurs represent such an intermediate stage or stages in the development
>of true avian endothermy. Perhaps the question we should be asking is, Why is
>there endothermy at all?

See Ruben, J.  1995. The evolution of endothermy in mammals and birds:  from
physiology to fossils.  Annu. Rev. Physiol. 57:69-95.  

TDJ
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