I just bought 4 chickens - fully feathered but not grown - I call them juveniles but I'm not sure if that is correct. I've read about not adding adult birds to the flock and the dangers. It is after the fact but what about juveniles? I have them quarantined in the basement now and will be watching them. I'm a bit scared of adult birds but chicks I have to get so many and seem to end up with quantities of roos. Are juveniles safer or in the same class as adults?