Ok, these chicks are about 4 1/2 weeks old. You can see this guy has a little comb starting; he's also noticeably bigger and his legs thicker than the other two RIR chicks. Or the barred Rocks, for that matter. Here are the two other RIRs Here's 'Mr Red' in back of a nosy BR, and a RIR He's also, as you can see, a completely different color from the other two. Sigh... This is the third time I've gotten chicks from this same LFS, and will be the third time I've ended up with a roo. They said they are only guaranteed 90% accuracy on the sexed chicks, but I'm certainly getting less than that from them!