well I hatched these 6 chicks and yes I am guessing that the 2 chicks that always come running to my hand are roos. unless someone tells me all ee chicks are extremely friendly, I have 3 and only 2 come running out when I open up to see them, and literally jump in my hand, I'm not feeding them so there is no incentive except being picked up. my last chicks the only 2 friendly 1's that I had were both roos. the rest peeped and peeped if picked up.