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Re: A question concerning the BCF hypothesis

>  I don't think the logic here is good at all, really.

Neither do I; have you, BTW, found out the author of that website? I
couldn't find a name anywhere there...

> Is this really how the
> BCF goes? >>
> No. Evolution of a four-chambered heart would represent an >improvement<
> an arboreal animal but is certainly not a >prerequisite< for arboreality.
> would also represent an improvement to a terrestrial animal, however.
> Separation of pulmonary circulation from systemic circulation seems to
> been a good thing all around. Probably more important to the evolution of
> dinosaurs and birds than endothermy, for example.

I'd say a four-chambered heart looks like a prerequisite for endothermy,
doesn't it?