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!!

For about 5 years there were a pair of Carolina Wrens who built a nest on our screen porch inside a grocery bag filled with other grocery bags that hung on a hook outside the kitchen door. The little rascals squeezed under the screen door through a space so small that until I saw one of them do it I would have said it was impossible. And each year when the nestlings fledged and left the nest there were always at least two of them who couldn't follow their parents under the door. My wife or I would have to leave the door hooked open so they could leave. Once it took three days for one chick to figure it out, even with its parents repeatedly coming in to lead it from captivity.

Because of the time frame, are you sure any that hatched didn't already fledge? I would count the eggs. It could be that none of them hatched, but maybe some did and fledged? If the eggs were fertile, they should have hatched weeks ago.

Hey Zach, I posted that pic on another forum once and one guy said "where's the bird??" haha I absolutely hated eventually pulling most of the volunteer milkweed out of the garden because it shaded some other things too much and got so tall it would fall over. I couldn't believe how big it got.......about 9'! We have about 35 acres that are woods and field, but we're letting the field do whatever it wants. We have tons of milkweed. Unfortunately, in the past couple of years, we hardly have any butterflies. :( Hopefully that's just a temporary thing. But the milkweed is popping up everywhere now, so our fingers are crossed that the monarchs and others will see them and come visit. tmc.....do you have Carolina wrens too? They can pick some of the funniest places to build their nests. I posted a pic on here of one this spring that built it's nest in a pot that I had made long ago and left it on the porch. They can sure belt out their song.