I've got 13 Chickens.. and I'm just wondering.. since I am so new to this.. which ones are the roosters? I don't recall their age.. I'm guess 4 months old, maybe a little older.. regarding the Roo's, should I look for a wallet chain or?? Seriously though.. sorry for such a Newb question... but I only want one roo... and I am getting curious how many I really have. Thanks!