We have feathered_wings which applies to both angel or bird wings or anything else feathered, we have insect wings which, while much smaller (only 10k) encompasses things that are very visually different. But we don't have a tag for the (often very simmilar) demon, bat and dragon, etc wings. Other sites call this membranous_wings and I really can't think of better name (I don't think "skin wings" would work).
For comparsion here is how simmilar demon and bat wings are post #9332185 post #9332471 post #9324282 post #9330361
Not to mention being able to tag generic anime girl 32827894 who has wings that are inderteminable as to wether they are supposed to be a demon, a bat.. like we can tag feathered wings on things where we don't know if it's an angel or a bird girl etc. The current post count of bird_wings or angel_wings or feathered_wings is 103475 (note feathered_wings is very undertagged) and the current post count of bat_wings or demon_wings or dragon_wings is 115840. Meaning the tags would be roughly the same size as feathered wings.
For those concerned about same-yness, the split between demon and bat wings is a lot more equal than bird vs angel so it would actually be less samey than a correctly tagged angel wings.
The sheer would be size of this tag (even if it was about as untagged as feathered_Wings, feathered_Wings still has 70k posts) meant I thought it was probably a good idea to ask the forum before creating this.