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The black one on the second picture look like Astralorp, but on the third picture the chick look like Ameraucana or Easter Egger, because it looks like little muffs start to develop on her face. Is it a same bird, second and third picture?
Do you have ANY information about where you got them, what breeds are possible, etc? Blue/black/splash projects seem to be very popular these days and at this age, the chicks could be absolutely anything.