At any time we have 4+ pens (3 pheasant pens, at least one chicken pen) with birds and food in them. Last fall a ton of house sparrows started coming into my pheasant pens. Almost any time i walked out there would be a flock of 50 flying away. I changed the feeder set up and that helped some. Eventually I head to put the plastic deer/bird net over the 2inch net on my pheasant pens. That cut down a lot but then the birds either found hole or moved to the chicken food. Over winter the chicken food is in the greenhouse. A couple days I would go out and block the door and get some birds, only got a few sparrows, but a lot of starlings. Now the birds are starting to come back in the pheasant pens, they are finding more holes. I'm thinking of getting a repeating sparrow trap. How effective are they? Thanks for any responses you may have.