catterfly:

okay so like two weeks ago my mom and i sat down and talked for two hours or more on how the heck human skeleton structure would work with wings, and we figured it out (sorta).

imagine, if you will, a spine’s length of vertebra. fuse two/three(/four??) together, depending on the size of your wing (Kaj has five total fused, three near her shoulderblades, two in her lower back, cause she’s got two sets of wings, one smaller than the other). Now flatten and spread them out a little bit so they’re like a little diamond-shaped plate of bone, and separate it into left and right halves and fill that with cartilage for slight flexibility. Then stick two ball-and-socket joints on the edges (and.. a lot of musculature i haven’t thought of yet haha) and TAH-DAH wings. (Kaja does NOT have a keelbone as birds do cause… i hadn’t thought that far ahead when i designed her years ago) Yes, this means Kaj is not very flexible in the back, and will have problems bending down/over to pick things up(besides the whole… wings in the goddamn way problem she eternally has)

The elbow and wrist joints in wings and human arms are rrrrelatively similar, so a hinge and then a hinge/limited-ball-joint? i haven’t manipulated a bird’s wing in a very very long time, so I’m a bit shaky on it and i haven’t looked at any birdo skeletons recently

sorry it’s not my oc so it’s not my place to say but i wanna butt in here a bit. u can ignore me if u want, i don’t mind

 but i’d also think her chest structure would be a bit different. She’d need a bit more/maybe stronger muscles in the front to help her pull the wings down. Maybe a second set of pectorals? larger obliques? 

and, now that i’m thinking of it, she’d probably be more susceptible to breaks, too, since bird’s bones are hollow so they’re light enough to fly.