We have 3 Buff Orpington and 3 Black Australorps.... 3 or 6 nesting boxes?? I have read 1 per bird as well as 1 for every two birds.... By the way.... I have enjoyed every step of this adventure..and find it amazing that the folks her on BYC are so helpful.... I lookforward to the days that I can provide help to someone new to this ...this...this...FUN!!