Geese rubbing head/neck on grass

[zydrate]

I noticed an odd thing today that I've not seen my geese do before, I let them out to eat grass and a couple of them kept doing a motion to rub their head/neck on the grass in between eating pieces, the only way i can think to describe it is as if they were 'marking', like how a cat rubs its face on things to get their scent on it, but as far as I know, pretty sure geese dont have scent glands on their head/neck and dont use scent for things.
So its definitely not an emergency or anything, I'm just curious as to what the behavior is, is it common? Do any other geese owners see their geese do this?
I tried to video it but they stopped soon after and I only got one do it very briefly, heres the link to the vid

 

[DerekAR]

My chickens do something similar and I just assumed they’re cleaning their beaks.

 

[Goosebaby]

Courting or Bathing behavior, water doesn’t always need to be present.

 

[zydrate]

Yeah it's not their beaks they're rubbing, just their neck/head area, almost like the bathing motion, but not quite