That does make it more intriguing! Interesting is that both your boys had the white spot on top of the head when they were little which is consistent with a male chick in an auto sexing breed. Not sure what to make of the darker coloring.Thanks so much for all your help! Once I looked them up, it did make sense that they were bielefelders because we did have a large influx of German immigrants here back in the day. The thing is that the Bielefelders are an auto-sexing breed, and in all the photos I saw of the little chicks, they were far more blonde. My guys were born black. In the photo below, the 2 on the right are the chicks in question; the one on the left is a Plymouth Rock female, I think. Still think they're Bielefelders? It's so odd that I have 8 new babies, and I am SURE I have some roos in the mix, but no one is crowing. They are 10 weeks old.