Yeah in the previous post I compared the wings to hands in a less accurate but easier to understand way. The wing bones actually work like: the palm is longest part, then wrist to elbow and lastly, elbow to shoulder is actually very small for birds and it never has wings connected to that bone! But sometimes chest feathers cover the bone making it hard to notice :D
I'm just practicing explaining xD It will be tricky making a post haha

Don't worry there is an upcoming whole page of just bats xD It's still just pencil sketches tho ^^