I have 50 buff orpingtons which are just over a week old. I have observed them and socialized (ie. played and cuddled) with them. They are already starting to come around and sit on me and be petted. I am noticing that some of their peeping is different pitched than the others. I'm not talking the alarm peep, just the normal peeping that they do, some are a little higher pitched than others. Is this a sign of gender difference or is this just individual differences?