okay i bought 15 roos from a lady to butcher but when i got them last night it was dark and i think i might have a hen or 2. i have never raised chickens and didnt plan on it but if i do have a hen or 2 i would keep them. i could always use more eggs how can i tell whats a roo from a hen? also she gave me a bunch of bantams? how big will they get? i got road island reds, cornish and something else but i cant tell whats a boy and whats a girl help!