Are Ameraucanas just mongrels produced by crossing Araucanas with other breeds of domestic chickens?
As far as can be determined no tufted-rumpless fowl were used to create any of the eight recognized varieties of Ameraucanas. Ameraucana bantams and Ameraucana large fowl are standard breeds. They have specific requirements with regard to shape, weights, coloring, comb, earlobes, and so on. While it is true that commercial hatcheries continue to cash in on crossbred mongrels by advertising them as Araucanas or Ameraucanas, it takes much more than eggshell color to make a true breed.
As far as can be determined no tufted-rumpless fowl were used to create any of the eight recognized varieties of Ameraucanas. The Ameraucana breed has specific requirements with regard to shape, weights, coloring, comb, earlobes, and so on. While it is true that commercial hatcheries continue to cash in on crossbred mongrels by advertising them as Araucanas or Ameraucanas, it takes much more than eggshell color to make a true breed.