The Ameraucanas are an actual breed, but Easter Eggers (essentailly mutts) are often sold under the name of "Ameraucana" (which are only come in certain colors and lay certain color eggs unlike Easter Eggers). Also great information on the different breeds! Also I would like to put out there that hatcheries now a days don't always follow the standards for certain breeds, for instance: I have Silver Laced Wyandottes which are a dual purpose breed and should be a reasonable size is not because they are hatchery quality (though not all hatchery chicks are not to standards).The Ameraucana "Rainbow": Several people have already correctly stated that these birds are essentially mutts and therefor their characteristics and personalities vary widely depending on where they came from. There exists a great deal of variance in the genetic quality of commercially raised chickens. Chances are you will find certain breed are better at certain activities like foraging and leadership.
I hope this was informative. Let me know If I can answer any questions.
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