Why does my rooster wobble his head?

Also, is it normal for chickens to shake their heads?

Songster. It is normal,unless it something that is constant; if constant I would check for mites/lice also check breathing maybe an indicator that they may have a cold.

why do chickens shake their heads when you talk to them? I raised parrots for many years before getting into chickens and I know that parrots shake their heads when you speak to them because it's how they recognize and acknowledge that not only are you speaking to them, but that they recognize your voice, and your tonal inflection.

Hereof, why do roosters move their heads?

In addition to being able to see their surroundings, it also helps them keep their balance . Much of a chicken's body (it's head, upper body, wings, etc.) is in the front, and the legs are in the back.

Why are some roosters mean?

Some breeds are more aggressive than others but even roosters from extra-gentle breeds, like Buckeyes, become feisty sometimes. Usually, roosters that don't attack people until they reach puberty perceive the humans they attack as a threat. Roosters are wired to protect hens. Roosters usually warn before they attack.