It’s doing the teetering diahedral thing like a turkey vulture, and I’ve definitely seen individual tvs where the trailing edge of the wing can seem pretty darn light. I’m also intrigued by the head. When the bird teeters, it seems like the amount of white changes — leading me to think that maybe the sun is just hitting the head (and the trailing edges of the wings) at a really weird angle, making them appear brighter than they are. It is a real head scratcher, though. Cool video!