I ordered 25 chicks from a mail order hatchery due to arrive at the end of the month. 23 females and 2 males as I will split the order with a co-worker. Is there anyway to tell which ones are male when they arrive so we can split them? Also I have a BR hen sitting on 23 eggs that are due to hatch the end of the month. Is it safe to put the mail order chicks with the newly hatched ones or will the hen hurt them? Thanks.