I wonder if this works with larger flies. Of course, I'm not sure if they would be drawn to wine/apple cider vinegar. I find that there are a bunch of large flies in my backyard around the stairs. I don't know why they congregate there but I assume it's because it's cooler around that area.I did a little project with my niece and nephew. We make little traps out of cups and paper funnels. Fill the cup (glass is good so you can look in) with wine, or fruit, and then tape a paper funnel over the top of the cup. The funnel can be made by rolling a piece of paper, taping it, and making a tiny hole by snipping the end with sissors. The flies can easily fly into the funnel as they go from wide to narrow, drawn in by the odor, but coming out is another matter. Then you just let them go outside.