Gibby, house wrens and house sparrows are entirely different species. House sparrows are a non-native bird and are considered pests by many, thus are not protected by law. House wrens are native birds and it is illegal to tamper with their nests. I do not allow house wrens to nest in my boxes, however, because as you said they are can cause harm to the eggs and hatchlings of other cavity nesters. I remove any sticks I find in my nestboxes and, fortunately, have not come upon a completed house wren nest (or else I'd have to leave it alone). Since I monitor my nestboxes twice each week during nesting season I can usually catch early nesting attempts by wrens and stop them. You can find out more about both species at this link: www.sialis.org Kathy

The magic halo works for the first week or so until they get used to it and brave enough to ignore it. My HOSP use it to swing on and land on the short perches I use. They also swing on it back and forth to get the seeds out of the feeder without having to actually land on the perches. It does seem to keep the numbers down as some are wary of it and it does seem to hinder them somewhat, but I have lots of HOSP and they will try anything.

I think wrens will build a nest anywhere they can possibly fit into. Had one on a tractor where a gauge had been removed. And that tractor was being used. But ----- one year I had one of those decorative ceramic houses and sure as heck a wren built a nest in it. Sad to say the babies fried. Had to take them out with forceps. Please do not use these houses for birds. They are an oven and no circulation. Sorry for hi jacking your post!!

I think it would be fine to turn back around to where you want it. I think the wrens would adjust to the new location. Wouldn't it be back in the position that they were used to anyhow?