So, these two are 3 months old, born on the same day and the one with a visible comb was like a late bloomer. It didn't have developed feathers and tails until it was 2 months old, while the other one had developed feathers earlier. After 3 months, the lately developed chick has grown a comb while the other hasn't.
Is the late bloomer one a rooster?
Is the late bloomer one a rooster?