This might explain a little bit, I hope.
http://www.ameraucana.org/history.html
No history of the Ameraucana could be complete without understanding some of the history of the
Araucana breed. But one should first understand that the Araucana as we know it, was never a pure breed, even in Chile.
To generalize the situation as briefly as possible; going back Prior to the arrival of the Spaniards, the Mapuche Indians in Chile had TWO breeds of chickens raised in different areas of the country: One they called the Collonca, which was small, laid BLUE eggs, rumpless, and had a small single comb; the other
they called the Quetro or Quetero, derived from their word kerto meaning stammering, referring to its peculiar crow. The Quetro was TUFTED, had a flowing tail, pea comb, and laid brown eggs --- Tufted rumpless occurred when a rumpless bird crossed with a tufted tailed bird, but these offspring were rare. The latter were later called Collonca de Arêtes by the Spanish, meaning Collonca with EARRINGS. These Collonca de Arêtes were blue egg layers, since the blue egg gene is dominant.
