i have 20 strait run chicks that are about 3 weeks... i can see that some of them are getting little baby combs those would be the roos i think but, some people have talking about just looking at the tails;large high tails would be roos. but after i looked closer i realized that some of them that have huge(compared to the other chicks) combs have almost no tail feathers and some that have really high, big tail feathers have no comb, so which one should i trust??