birds, bats, pterosaurs -- and fused backbones

IIRC, flying birds have fused backbones -- with the exception of the neck and an area just before the tail. Having a rigid back seems necessary (to me) for flight.It would seem reasonable to me, then, that bats and pterosaurs should also have large areas of their spines fused together.I have done several searches on Google for information about bat spines but all I can find is information regarding wing structure (which is pretty interesting).So...anyone here know about bat spines? Pterosaur spines?I'd love some links to info if possible.Thanks,
--Jason

I'm not sure what you're after, but here's a link you could start with (that for reasons I cannot explain I had saved on my computer).Digimorph - Thyroptera tricolor

CLOSED