NEW PICS BELOW! Give me your two cents-- I'll take it! Okay, I was certain that this was a girl until about 12 weeks, when he/she started sprouting a huge red comb and wattles. Before then, the only thing about he/she that would have indicated anything "rooish" about the bird was his/her size-- always a tad larger than the other chicks (of differing breeds, but same age). My partridge rock roo that I got at the same time is DEFINITELY a roo-- has the shiny coloring, droopy saddle feathers already and has a comb/wattles the same size as this chick. But I've always known the partridge rock was a roo due to very very early comb development (funny thing is he was the runt of the litter and has always been on the small side). Let me know what you guys think. Would love to hear what other Columbian Rock owners think too! These are pics at 12 weeks. The comb has gotten a bit larger and redder in the last three weeks (they're now almost 15 weeks.) I will take any tips on what to look for around this age to differentiate gender! Some I can tell for sure, but others it's harder. Like this columbian rock! Thanks!! (I'm a first time chicken owner!) New pics (at 15 weeks). Examined the hackle feathers this a.m. and they looked rather rounded (like a spoon.) His/her tail looks a bit droopy in the picture, but not really as much as my 100% rooster's tail. What do you all think??