Chicken shooking

[Srlimon]

One of my Isabrown sometimes shook herself and make a funny noise which I wasnt able to record yet and havent seen before. She than stais "popped" like in the picture for about 1or 2 minutes and goes back to normal.
She otherwise looks healthy and active. Anyone experienced this before?

 

[tacothechicken]

Could she be mock broody? Or have you checked her feathers for lice?

 

[aart]

One of my Isabrown sometimes shook herself and make a funny noise which I wasnt able to record yet and havent seen before. She than stais "popped" like in the picture for about 1or 2 minutes and goes back to normal.
She otherwise looks healthy and active. Anyone experienced this before?

Welcome to BYC! @Srlimon
More info needed:
How old is she?
Is she laying?
Does her poop look OK?
The stance she has in the picture may denote some discomfort...
...or she may be passing a softshell egg.