is this normal?

[Zawisty]

look at the rooster in the video link below, the moment just before jump.. the 4th second
is it normal
https://drive.google.com/file/d/1zreVAfpvaFNJHhQvyQB_ZHb36YYYPVIQ/view?usp=drivesdk

 

[sourland]

Nothing appears abnormal.

 

[Zawisty]

the head shaking
this rooster is the dad of my roosters
they are 3,
they starting shaking head around 7 months old, 2 of them. died, the last one now he is 13 months old, looks very healthy, but he still shaking ng his head in the same way of his dadd in the video