Does anyone know what might be wrong with this Robin? Perhaps it's not a problem and he's just signaling to other birds but he's been nodding in a jerky twitch movement, we've seen him doing this constantly for around a week now.
Otherwise he seems to be acting and eating normally if not a bit overly territorial chasing other birds all over the place.
Vid below...
https://youtu.be/kyeY6d4xxsw
Unicum arbustum haud alit duos erithacos
(One bush does not shelter two Robins)
Zenodotus (3rd Century B.C.)
Could it be (repeatedly) sneezing? I had a quick look around and it seems similar to this clip here.