Hello, I have 15, 1 month old chicks I will soon need to be separating and weeding out. I have 5 Sebrights, 5 Sultan bantams and 5 D'Uccles. I think I have the sebrights figured out. Some have a wider, lighter colored strip in the comb area...I'm thinking these will be roo's....I almost thought the dark earlobes on some would be the key, but maybe not. The D'uccles look easy...some have a higher comb already growing in about a 1/4" tall. I'm thinking they are also roo's. The Sultans are hard to tell...they all look the same except for the haircut. some have stiff mohawks, some have more of a puff ball...some cover less area,some cover more area on the head. The biggest Sultan I have acts like a roo when I let the chicks out in small batches to frolic in the grass and dirt...it leads them all around and the rest follow. It also has the biggest puff ball haircut... One other thing I noticed...The ones I think may be roosters will not think twice about going after bugs...they love to uncover crickets. The others will be more cautious and shy away, even if I drop a cricket at their feet. Any help would be appreciated. I haven't been able to post any pics or I would...if that would help any.