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I don't know where MyPetChicken gets their EE's. My understanding is that they do not hatch their own but get them from different hatcheries. If you knew which hatchery it came from, then people that got EE's from that hatchery could possibly tell you the tendencies of their chickens.
Many people confuse all these various traits with EE's. EE's are simply chickens that might lay blue or green eggs. Muffs, tufts, leg color do not matter. They don't even have to have a pea comb. The blue egg gene follows the pea comb a lot (one expert on here posted that the blue egg gene follows the pea comb 97% of the time), but if it is mixed with the rose comb, you get a walnut comb, and there are some that have a single comb.
The original blue egg layers came from Chile. There was no standard as far as any appearance is concerned. The appearance was pretty much as mixed as barnyard mutts can be. Someone developed the Araucana and Ameraucana breeds from these chickens with the blue egg gene and picked certain traits they wanted their new breeds to have. The muffs and tufts went with them so they kept those. The pea comb was normally associated with the blue egg gene so they chose that. The legs could have been any color. They could have chosen any color or pattern. But, for their own reasons, they chose as they chose. Many people think that the EE's come from Ameraucanas so they think EE's should have the same general traits as Ameraucanas, but the development went the other way. If you cross an Ameraucana with another chicken, you will get an EE, but Ameraucana does not have to be in the mix.
A lot of hatcheries further confuse the issue by calling their EE's Ameraucanas. They are not. They are EE's.
The blue egg gene is dominant. If the chicken has one blue egg gene, it will show up, but it may be blue or green. The basic egg shell color is either white or blue. If you break an egg and look at the shell color inside you willl either see blue or white. But many hens put a brown coating on top of the shell. If the brown coating goes on a white egg, the egg is brown. If the brown coating goes on a blue egg, the egg is green. How much brown determines the shade.
If an EE hen has one blue egg gene and one white egg gene, the blue egg gene will show. But if you cross her with a rooster that has none or only one blue egg gene, some of her offspring willl not have the blue egg gene. some will but some won't. That's why some hens that hatch from blue or green eggs do not have the blue egg gene.
Here is my green egg laying EE, the one with the blue bands on each leg. You can't see it real well, but her legs were yellow. Her comb was sort of a modified pea. Due to some irresponsible pet owner releasing dogs inthe country so they can live the good life, this hen is no longer with me, so I cannot get better pictures.
https://www.backyardchickens.com/forum/uploads/22249_no_tuffs_20_w.jpg
sorry for your loss--but wanted to let you know she was beautiful..