We do, actually!. Recent research proved there are melanosomes in some fossils/imprints, which were previously thought to be bacteria. This gives us a fairly good idea of the colouring of certain species. Check out this sinosauropteryx:
I highly recommend reading the book Dinosaurs: New Visions of a Lost World. It’s fun to read, has amazing illustrations and was written by one of the people who discovered this.
That is so cool!
That guy looks fren shaped.
You want fren shaped? Check out this cutie!
This is what I imagine an owlbear looked like
Wait
Is that fur?
Composition? I tried googling it. Found an article which says that while hair is made of keratin, feathers are also made of keratin, but the keratin is different.
¯\_(ツ)_¯
Maybe someone who knows what they are talking about will chime in. I am not that person.

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.

This is chicken slander, they’re chill af once you get them to trust you.
Roosters are demons though.
Chickens are awful creatures, a giant one would fuck you up for absolutely no reason
But if we Jurassic park these mutherfuckers I guarantee KFC would start serving up Kentucky Fried Dinosaur.
Man they’d probably taste fricken awesome. And the occasional news story of a battery farm of dinosaurs getting mass released into the environment, towns getting overrun by giant feathered dinosaurs would be a sight to see.
“I like my imagination more than I like learning about nature”
Feathers are fucking rad and I can’t wait for more weird critter traits