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Re: bauplan convergence



well, as I've been saying, lemurs don't flap.  It's probably that these
few therapods in the trees had a tendency to do so.  They seem to have
had the ability to flap certainly.

-Betty

Rob Gay wrote:
> 
> >From: "Ahmed al-Mahasa Sha'ad" <am_shaad@hotmail.com>
> >If this happend in origin of birds it does NOT mean it MUST happen in every
> >linage of tree-living predators.
> 
> So the question is, what drove this to happen in birds and not in the other
> tree-dwelling predators? What sort of circumstances, that are not present
> today, would make therapod dinosaurs fly? Many of the animals that live in
> trees today, or at least have some history of climbing trees, have fur,
> which could be adapted over the course of time, to become something like
> feathers. (Interestingly enough, the only flying mammal, the bat, uses skin
> flaps and not modified hair). So far, however, this hasn't happened. I see
> the evolution of hair into feathers to be much easier than the evolution of
> scales into feathers. So, if we have a population of small therapod
> dinosaurs living in the trees, fulfilling the role of, say, lemurs, why did
> the dinosaurs start to fly, and why haven't lemurs taken wing?
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