Which hen did this egg come from?

[Celizwalsh]

I have gotten acouple speckled eggs and I can't figure out which hen is laying them. At first I thought it was just a fluke and could be extra calcium deposits or something but its been happening pretty regularly now. I know it isn't the ameracauna hens because they lay blue eggs but beyond that I'm stumped. The other possible culprits are 2 buff orpingtons, 2 rhode island reds, 2 wyandottes (one silver, one gold) and one speckled sussex. Are any of those breeds known to lay speckled eggs?

here is what they look like

 

[mtngirl35]

I have 2 barred rocks, 2 black sexlinks, a black australorp, and a mixed breed hen of unknown parentage. I get speckled eggs all the time. Don't know who's laying them. And all my girls are fed a good diet and are healthy, though, so I hadn't really given it a second thought.

 

[islandgirl82]

Here is a fantastic article about various egg issues. #9 is about speckled eggs.

https://www.backyardchickens.com/a/common-egg-quality-problems

It could be any one of your brown egg layers so unless you catch her in the act...there isn't really any way of knowing who it is.