Hermitcraft Grian designs for each season.
Now a mini rant. Main bird wings are based on his overall theme for the season, aka his main base. However, the wings can change bird species to fit the skin or arc that happens in the season. Since they do represent the elytra, the wings can be absent. Gotta have break from drawing individual feathers eventually. S9 is special as it's the only time G got more bird like outside of wings. Bird choice reasons somewhat explained below