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Re: Microraptor Had Iridescent Plumage
On Mar 9, 2012, at 11:28 AM, "Ben Creisler" <firstname.lastname@example.org> wrote:
> From: Ben Creisler
> The long metatarsal feathers on Microraptor are clearly asymmetrical
> and so must have had an aerodynamic function with no analog in modern
Well, it doesn't mean they *must* have been under lifting loads, but the
probably were. That said, no weird twisting, splaying, sprawling or other
oddness is required to get reasonable use out of them.
> The alula functions to prevent stalls in landing when the wings
> in modern birds are at a high angle of attack.
Actually, that's never been shown. We know when the alula is deployed, and it
suggests vortex generation during near stall as a function, but the slat
concept doesn't jive and there are other options, too.
> Microraptor likely
> glided and landed differently from any modern birds as suggested by
> studies and illustrations. If it often landed belly-forward on
> vertical tree-trunks more like a flying squirrel as the artwork
> suggests rather than belly-downward on branches or the ground as
> modern birds do, an alula may not have worked. Clearly a better
> understanding of the function of the metatarsal feathers is needed.
> The artwork also shows Microraptors perched on branches. I'm wondering
> if a Microraptor could actually land on a branch like a modern bird.