My chicks are a day shy of three weeks old. They came from the "pullet" bin at TSC, but I've seen how they clean the bins - even if sexed correctly to begin with, there's no telling if you certainly get what the bin is labeled as by the end of the day. My most colorful chick has been dry-crowing the past couple days. Sort of a noiseless cock-a-doodle-doo, with a distinctively "rooster" pose. I will try to photograph her doing this, and will update with pictures when I have them. Time will tell if she is a rooster.