If you do the math on the ability of this species to reproduce (2-3 nestings with 4-7 chicks per nesting) and the average life span (roughly 12 years), you realize how eliminating one breeding pair has the potential to have a tremendous benefit on species diversity, even within a small area. Kate: Sounds like you have had a lot of success. The Huber trap is a great idea. There are also others that are nice. Here is the web site for one: http://www.vanerttraps.com/universal.htm You may be aware of this, but I just think this caution bears saying for those who are reading: The one problem with putting in-box traps in a bank of martin houses is that you are likely to trap native birds as well. You have to monitor these kinds of traps hourly (which might be hard given the height of them) to make sure that the trapped bird is the intended target species. If it is not, you actually risk the life of the native bird(s), which, of course, is illegal as well as inhumane. So monitoring is absolutely essential. I would agree with everything else that you have mentioned. Certainly the males are the ones that control the area and have the most potential to harm native birds through passive and active competition. Most people who do this would agree that one of the best ways to catch them is with in-box traps during the heat of the nesting season. They are very saavy about ground traps. You can sometimes bait the ground traps with nesting materials that are glued to a heavy piece of wood (ripped plastic tarp material, trash, tissues, yarn, etc.). The best season to catch the adult males (and females) is the early spring. During the summer, it is best to use a ground trap baited with white bread. You can catch young birds and females by the dozen this way. I have included a link for a very good repeating ground trap. Good luck to you Rose. I think that everything here is really true and if more people would consider doing a small piece of this big problem species diversity could be noticably improved. Of course, this is all contingent on the laws in Canada. Here is a link that might be useful: Repeating Ground Trap

My husband thinks if we plug up the hole, the wrens will go to the other bluebird box so we'll just keep taking out the twigs. She builds a perfect circle of twigs morning and night. As I walk back from destroying her work if just look over and say, "Sorry little bird." I know it's for the best. I've figured out a way to stop feeling guilty about it; I just have my husband do it! Plus I keep picturing the destroyed bluebird eggs I've seen from what the Wren's can do. Thank you all for your advice. Now we just need our Blue's to start building!

Bet, Thanks for the response as the email had some kinda error & was returned. Okay, obviously I've just been lucky so far. If I take down the boxes in the thicket (woods) & put wren guards on the BB houses in the fields, remove "dummy" nests-is there anything else? I didn't actually encourage them in the first place, these boxes used to be in a grassy area but I let it grow up for a more woodland habitat. Also the CA Chickadees use one of the boxes in the thicket & this year sucessfully fledged 5 young!The dees fledged before the HOWR arrived. I would like to return the boxes in the fall for the flying squirrels & sometimes the downy's roost in them. Unlike the Carolina's who will come right up on the porch, the HOWR seems to stay down the hill in the cedar thickets-of course the Carolina's are year round residents & the HOWR aren't so maybe that's the difference. Thanks for everyone's sage advice & hopefully "my" wrens will not take revenge when I remove their boxes. (after they fledge this batch) Susan

Susan / catherinet, you do have valid points, nature is nature, especially when it comes to native birds, but you can also look at it as wrens are more than plentiful as well. You may not have problems with them now but the more there are, the more that will be in your yard and like this year it was cool even in May where I am and most of the cavity nesters in my area were just getting started on their firsts nest when the wrens arrived. I see and hear many wrens in my yard and neighborhood so they obviously don't need my help, they are more plentiful than the other species in my yard and less territorial. They will find natural cavities just fine. You know Eastern Bluebirds nearly became extinct after the introduction of house sparrows and European starlings in the last century. With man's help putting up nesting boxes and doing whatever it takes to protect them they have made a tremendous comeback. I like all cavity nesters and gladly share my boxes with any bird unless the species will do other birds harm. So in my yard, house sparrows, starlings, and wrens are out, and Bluebirds, Tree Swallows, Chickadees, Titmice, Nuthatches, and Woodpeckers are in.