Recently my budgie Kiwi lost his brother, Mango. He is about 10-11 so he is very old, but has been super healthy. I've been observing him to make sure he's doing alright now that he's a lone budgie. I've attached a video, since I've noticed that he's been either preening or plucking under his wing. He's had issues with feathers (he had to get a cyst removed) but that was a long time ago so it's unrelated. Does it look like he is preening or plucking?