Ameraucanas are similar to Araucana chickens because both have pea combs and lay blue shelled eggs, but they have many differences and are completely different breeds. Some other Ameraucana traits include full tails, muffs and slate or black legs depending on the variety. On average, Bantam cocks weigh 30 ounces and bantam hens weigh 26 ounces while large fowl cocks weigh 6½ pounds and large fowl hens weigh 5½ pounds.
The Confusion Between Ameraucanas and Easter Eggers
The Ameraucana Breeders Club defines an Easter Egg chicken, or Easter Egger, as any chicken that possesses the blue egg gene, but don't fully meet any breed description as defined in the APA standards. Further, even if a bird (that possesses the blue egg gene) meets an APA standard breed description, but don't meet a variety description or breed true at least 50% of the time it is considered an Easter Egg chicken. The American Poultry Association's American Standard of Perfection contains breed and variety descriptions of all recognized standard breed poultry in North America.
In other words, most Easter Egg chickens are "mutts" which happen to carry the blue egg gene. True Ameraucanas are rare.
Here at CWC we breed true to the Standard and do not mix our birds with Easter Egg chickens. We currently only keep the Lavender and Black (split for Lavender) color varieties in Ameraucanas but will soon be adding more variety to our flock.