Mystery Egg

[Carriebean]

A 'true' Ameraucana will lay a blue egg. Since yours lays cream colored eggs, likely has something else in it's parentage and would either be technically an EE since it doesn't meet the APA standard, or one that would not be useful for breeding true. I'm sure she's a beautiful bird regardless. True Ameraucana's are bred for the blue egg as part of the standard. The whole Ameraucana/Americana/EE debate goes on...........It's always questionable unless they come from a reputable breeder, and only matters if you are breeding or selling or showing.
The best place for information on the Ameraucana and standards are here:
http://ameraucanabreedersclub.org/default.html (go to the FAQ page, click on the last question "Why aren't my Ameraucana's laying blue eggs?"
And here: http://ameraucana.org/ (this page has photo's of the accepted colors: http://ameraucana.org/Photos)
I would guess that one of your EE's is the one laying the pretty blue egg. I currently have 3 EE's laying, all lay blue, and two EE(hen)/Wyandotte(roo) mixes that lay blue-green eggs, blue with a bit of brown over it to make greenish. I have an EE(hen)/Wyandotte(roo) mix rooster whom I haven't hatched from yet, so remains to be seen what gene he will pass on.

She's probably not purebred since I got a rural king. But she is a beautiful bird and looks exactly like a purebred one except for the egg I know for certain The Blue Egg is not hers because she laid her normal egg yesterday. She is the oldest of my bunch