I remember our aummer intern had wondered as well. I recall saying to her "Well, I ordered 50 hens (females) and no roosters. If I had ordered a rooster that would be it but we only got hens".
All was explained to me very clearly at 6 am a few days ago as I worked frantically in the barn trying to gets seeds out for planting to beat the coming storm . "caaauuuu" it called from the coop, it's first call from it's immature throat. Oh no, I thought.
We've got a rooster .