Oh, I forgot to say that, our hens only bok bok loudly when laying eggs or something is wrong and they are calling me!. Also, as well as the aubiose cutting down the odour of hens, I add a handful of Bokashi bran into their layers mash which results in odourless droppings. I do'nt think I have anything else to add except we love our hens and do'nt regret having them.They are really cute and can take your mind off more serious issues giving you time out.