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Re: pterosaur femora sprawl
> > True. But no pterosaurs walked, bipedally or quadrupedally, with a
> > horizontal backbone.
> I'm not sure how you can know this (is there something I've missed?). In
> any case, the fore(walking)limb is always longer than the hindlimb. This
> would result in the backbone on a slope even in the shortest forelimbed
> critters when they had their hands on the ground.
True. BTW, I've reconstructed hundreds of pterosaurs, down to the species and
specimen. All balanced on two feet. Plus a half-dozen skeletons in 3D.
> Now, the point of this argument (I think!) was about whether pterosaurs
> had the legs for a bipedal launch. Lots of pterosaurs obviously had
> teeny-weeny legs (shorter and less robust than an albatross), which were
> probably inadequate as the primary launch mechanism. Derived
> ornithocheirids are not a special case here, we see it in lot of them.
Ah, so! Lots of Rhamphs had tiny legs. But that is derived. And who knows?
Perhaps like hummingbirds the habitually landed on vegetaton.