Response to flys

I have used a mason jar( or something similar) with a funnel set into the top so the small part of the funnel is down in the bottle. Put some meat scraps and water in it and let it ripen just like the commercial traps. The flies can get in but have a hard time finding their way out the little funnel opening. It catches a lot of flies but I started to wonder if maybe I was just attracting flies that wouldn't have normally come to the area.?

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