How old are chicks before they start laying? My "big girls" are about 3 months old now, and they are fully feathered out; looking like real chickens now, and one of the roosters even tried to crow a bit, (sounded like a rusty gate). They are talking in real "chicken talk" squaks, not peeps anymore. Should I make sure they have nesting boxes available to them soon? Right now they just use their roosts to sleep on.