I've noticed the penciling, but I never thought about the solid black collar...interesting!Your black & white EE might be a boy. I have noticed that my EE chicks that develop a solid black collar behind the neck end up as roos. The ones with a more penciled collar turned out pullets. A lot of solid white wing patches (on black & whites) or solid red patches (on other colors) are other feather coloration clues for males. Of course there are more things to look for in boys like thicker legs, 3 rowed comb, early red comb, & upright stance.
My rooster age 4-5 weeks (Notice the black collar, thick legs, & red spots could be seen even before he got all his feathers.) The second pic is the same boy (older) trying to show his girls how to lay an egg.
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Here's my EE pullet at around 7-8 weeks. Her neck feathers looked pointed b/c of the penciling, her tail curved, & the summer heat made the comb look darker. We thought a male until someone pointed out that the penciling was more of a female trait. The actual feathers are not pointed. We never believed it until she laid her first green-blue egg.
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Someone already said this, so I'm agreeing

#2 & #4 look like pullets, #3 looks more like a little roo, #1...tos up..I feel like I'm leaning more toward roo but I couldn't give you a specific reason lol
I'm going with the others: black and blue: pullets, barred..that comb looks more male. But I've heard brighter barring means male and darker, more blurred barring means female?thanks kenzier and ladycluck!
anyone else want to lay their bets?
x
That may not apply to EEs though. Don't get your hopes up! lol

Yeah...my 2 buffs were nowhere near that developed at 13 weeks. One of mine is STILL lighter than that and she's 24 weeks today.Given what I have just read about sexing EEs, I have these photos for you to consider. I bought 10 chicks, all supposedly pullets, born on March 26. 7 are EEs, although sold as Araucanas, and 3 Buff Orps. The B&W one in the 2nd photo was about half the size of all the others when they were about 2 months old, but now that she has caught up in size, she looks to me to be female. The EE in the last 2 photos however, has more of the body shape discussed here and might be a cockerel? Curious to know what you think...
(pictures uploaded backwards...)
First photo of the Buff Orp—she must be a he—she looks nothing like the other 2 who are exactly the same age. They don't even have combs yet.
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The first B&W is a pullet, second is a roo. He looks like he'll be quite the looker though.