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Re: Greg Paul is right (again); or "Archie's not a birdy"

On Thu, Jul 28th, 2011 at 10:17 AM, Tim Williams <tijawi@gmail.com> wrote:

> Coincidentally, among mammals aerial gliding has evolved exclusively
> in herbivores.

The earliest bat fossils appear to be insectivores though. Perhaps when 
predators develop flight, 
they jump straight to active flight and forgo a passive gliding phase? Or at 
the very least, any 
passive gliding stage might be shortened (geologically speaking) by intense 
selective pressure to 
retain the ability to persue prey (which I would imagine parachuting membranes 
would hinder 
greatly). It might explain why the earliest pterosaur and bat fossils already 
seem to 
have 'advanced' flight adaptations.


Dann Pigdon
Spatial Data Analyst               Australian Dinosaurs
Melbourne, Australia               http://home.alphalink.com.au/~dannj