Araucanas are a breed originating out of South America that have the blue egg gene. They are rumpless, and tufted. They lay Blue Eggs.
Ameraucanas were developed from Araucana's, but have a very specific breed standard of their own now. They have tails, muffs, beards, and only come in 8 recognized colors (Black, Blue, Blue Wheaten, Brown Red, Buff, Silver, Wheaten and White). They lay Blue or Green Eggs.
Easter Egger is a catch-all name for any bird that carries the blue egg gene but neither conforms to the specific Ameraucana or Araucana breed standards. So... you could have a bird that was hatched out of an Ameraucana X Ameraucana breeding... but if it isn't one of the 8 recognized colors, or has the wrong shape of comb, or isn't bearded, or has yellow legs... or some other expression that falls outside of the standard, it's called an EE. Often times they are mixed breed birds, so they can lay anything from Blue to Green, to Brown, to Pink, to White depending on their individual heritage.
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