I raised my first fock of six chickens and lost most after a few years to predators. When I was raising them I never thought anything about them possibly being a rooster I just assumed the hatchery was correct in sending what I ordered. It worked out just fine. I have not had a great experience with the hatchery I ordered from this year and being more experienced I am paying more attention to the chicks as they develop. I also picked some up from a feed store and am paranoid that everything I have Is a rooster. I definitely don’t trust the hatchery. Does this olive egger at 3 weeks look like a rooster. It just seems the comb is large but I have a few other birds that I think are mutts that have about the same size of comb.