Surferchickin is right. Silver Laced Wyandottes all develop rose combs early, and both sexes develop pronounced and pointed cowl feathers at 9 weeks. Here is one from this spring's brood that we wondered about. "Buster" was larger, with the earliest comb. Long pointed cowl feathers. Here is Buster at 9 weeks:
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Any time I dropped down to take photos, Buster would attack the camera:
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Roo, you might think. Well, Buster just laid her first egg this week. Wyandottes grow fast compared to other popular breeds, and both sexes develop longish cowl feathers. Sexing them at 9 weeks is pretty dificult, if not impossible So you really won't know until one develops saddle feathers and crows. Yours is most likely a pullet.