I for one like theropod chickens.
Scaling up a regular chicken always seemed more realistic & intimidating.
When flying all objects are fairly far so it’s like their POV isn’t really moving (it’s not a yes/no, it’s by how much).
On the ground the distances are a lot smaller & more relevant.
If they bobbed their had bcs of their limited eye socket movement (they can move them a little, some species a lot) they wouldn’t do it when not changing the direction of where they are looking.
(It’s prob also why you can hypnotise a chicken in a second with one move of your finger but not eg a parrot with more brain buffer.)
But we all do it, humans (prob mammals) have this trick when you “lose time” when calm & moving the eyes and/or head from one object to another. We don’t perceive it as such unless you look for it (you don’t remember the details of the panning - but you do when eg playing sports). A bit like you stop processing your nose in your fov.