The chick in the back with black edging on the tail is a roo BUT the chick in the front its tail curls? The roo chick in the back hatched a week earlier than the one in the front but they are both from the same parents. The other hens in the clutch their tails do not curl like the odd ball in the front. Is this a sign that it will be a rooster but with a better tail its comb is not as developed as the one in back but like I said the mystery chick is a week behind the roo. I'm trading two poulets for some Deleware chicks and just want to be sure I'm giving them poulets so I asked for a week to be sure that I knew which chicks were girls and which were roo's. They are 4 1/2 months old.