Duckworth
Songster
I put the air fresheners on all of the mesh windows using zip ties. It’s hard to say how much it helps, but I think there would be more flies without them. I also have them all over my back porch around my kitchen door.Too much ventilation for any air freshener in their house and pine shavings for 17 ducks? They would have to lay much more eggs before i can afford that. I can leave the straw in for ~3 months and only add a thin layer every weekend, i know what they would do with shavings…
Consider putting one or two of the smelly jar traps away from the duck house and your house and see whether the flies go there instead. I have the reusable ones, which means dealing with the dead flies, but the fact that they fill up with dead flies is encouraging.