let us consider the evolution of birds from Theropods
The Archaeopteryx has a furcula but no "Keel" however they were thought to be more gliders than fliers.
Finally a chicken. A distinctive furcula and a "keel" !
Note that they also lack scapulas shoulder bones.
The wing muscles attach to the sternum and wishbone.
Note how and where the muscles attach.
Consider this where would the wing muscles attach on a winged humanoid "biped" or quadroped with six limbs? If you don't want to give them a pronounced "keel" or sternum do the flight muscles attach to the furcula instead? Or do you redesign the clavicle and scapula bones?
No do not moan but its my fantasy and go back to drawing wings like they're pasted onto the back .
Next time more anatomy to study and please think about!
It took me half a hour to find a collection of images to share so why havn't you done that too?
I will be looking at the body stance of bird species that walk and climb or run so much as they fly.
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