Yolks changing colour daily?

[Nonny]

We only have one girl who's laying right now, and the last 5 eggs I had from her had 2 with really dark orange yolks, and 3 with paler orange yolks. I'm not 100% certain which order they were laid in, but I had a feeling that there was at least 1 pale one laid either side of the darker ones.

Am I delusional, or can the yolks really change from day to day with the same chook on the same diet?

 

[Niss]

Is it really the same diet? Did she get more bugs or eat more grass on some days?

 

[FireTigeris]

I keep saying the barometric pressure affects chicken behavior (feeding) which effects egg yolk color...

testing would be a devil to do so I haven't found enough helpers.

We are getting storms EOD at the moment- I bet from yolk color (and or shell color) I can tell the days they were laid (the egg made during the change is usally the light one often the 'next day's egg - after a storm)