Yes, the EE isn't exactly a totally mutt chicken, it is a crossbred bird, the purpose being to lay colored eggs, so it always (sort of usually) would (most likely) be half Ameraucana or Araucana, or maybe even more, depending on what breeder developed the line (or what hatchery)... If you order from certain hatcheries you might actually get some of their designer "blue egg layers", or maybe a cream legbar thrown in there, or maybe some actual Ameraucanas that don't meet the standard colors. I know some backyard egg sellers that will cross them with say, Rhode Island Reds to increase the egg production. Oh, and all those disclaimers up there are because since there is no standard for the EE "breed", people are going to do their own thing (and sometimes their own thing is to lie to you about what you are getting).