I have a 5 month old black sex link/black star. For as long as I have had it I believed it was a rooster. He took longer to feather out than the girls and he has always had a shorter tail. But I've found him making the same noises as my hens and today I found him sitting on eggs! I think he may have this behaviour since he grew up with all girls and our older rooster. Tell me what you think. The first one is from a few weeks ago and the rest are from today.