We bought (6) day olds on Jan 13. Later a neighbor gave us two of his chicks that he was worried about (the mama had been killed). We only want to keep two for eggs , so we were waiting until we could tell when there were hens and roosters. We thought the signs were developing (wattles and tail feathers and bigger feet) so we gave all but two to a friend of ours. Now, one of the two looks more like a rooster! So we will exchange back with our friend. I couldn't help but think what Jeff Goldblum's character said in Jurassic Park, that nature finds a way!!!