I bought 2 sex-links. When purchased as 2 day old chicks at the feed store I was told they were both hens for sure. Now they are 13 weeks and one is defiantly a rooster. I have done a little info digging on the subject and all I can find on it is that they are sexed by their colors after hatching....one color male the other female. These 2 of mine have the same color feathers. How often does that occur? Thanks PS Hope I picked the right place to post this.