Human-Avian Anatomy: Cleanliness Pt.2

Another entry (auf englisch) in my super duper anatomy notebook (Kentaro/Golden Boy reference). If anyone has any suggestions or if i missed anything for this section, please feel free to say so. ^^ I'm very open for discussion.

SubjectF2-164 had a wonderful question for me and I decided to answer this new challenge with multiple-sectioned tutorial. Here's her question:  "I just have a quick question: How do Avian-Americans clean their wings? Like, do they have to take four hour long showers? Or do they have that whole oil-gland thing?? Thank you

Also, the bird girl on the bottom right belongs to Gracie314 .
Wing Anatomy>>fav.me/d8eq8o1 http:/ Part 1>>  Part 3 Final>>

Human-Avian Hybrid Anatomy Idea.Theory.Art©Maxim Wolf (me )