I have 30 chickens and 2 goats, so as you can imagine flies are a problem. I am using the 'Flies be Gone' trap that works great, but it does smell and right now it is costing me $15.00 a week. I have been reading all of the "fly" threads, and I was thinking of getting some guineas for fly control. My questions are: Are they good for flies? What is different from chickens? Do the boys crow? What do the eggs taste like? Will the boys mate with my hens? Thank you so much!!!