Wrens are pretty bold in the bird world. They frequently build nests really close to human activity, so they seem to know what they're getting in for when the babies come. Maybe they instinctively know their little ones will be safer from predators when they live so close to humans. I had a Carolina Wren INSIST on building her nest in my newly potted hanging baskets this year and even though I took out the nesting material every single day before it really got built, they kept at it. They KNEW I was there, that I knew they were there, and that I kept tearing the nest up on a regular basis. They still wouldn't stop. That says a lot. I took down that basket and put up an empty, with a bedding of loose dead geranium roots, then put their nesting material on top of that, hoping they'd accept it. They did. They finished it out the way they wanted and now their hanging basket is the closest to the steps and to the front door. They seem perfectly happy with it. After watching them from my yard as I worked, after a couple of weeks, it seemed they had abandoned it. I never saw them again. One evening, just at dusk, I tilted the basket to peek inside and scared the mother off the nest. Again... not a peep for days. I had to practically camp out at my living room window to catch one of them. I finally am seeing them again, regularly, as the little ones are keeping them extremely busy. They're flying in with lunch and out with fecal sacs all day long, but you never see them if you're out there. I wouldn't worry about your activity near their nest, like cleaning away spider webs. You wouldn't believe all the rowdy things I've done on that front porch since they moved in. They probably will have one or two more clutches, though, before winter, so you may want to set up an alternative nesting site and see if they'll accept it, if you want to use your front door again.

I've been hearing the "cheery, cheery, cheery" song a lot this spring/summer. It's a bit similar to the Tufted Titmouse's "peter, peter, peter". My Crossley ID guide states that this is their best known song. Truthfully, this is the first summer I have kept track of passerines so I cannot compare to what is typically sung around here by that species. Today I heard the three syllable "teakettle, teakettle, teakettle" version. Carolinas change up their song so much. This post was edited by TMFF on Sat, Jul 6, 13 at 17:46

Thinking further about it, I don't need to prop open the cold frame, which would make a 4-foot long narrow opening. I have two ventilation holes (2 by 4 inches) in the back wall, blocked by hardware cloth and 16 inches above the ground. All I need to do is remove the hardware cloth, then install hole reducers to reduce the holes to 2 by 2 inches each. Each hole reducer can also support a shelf/perch INSIDE the box, which will allow the birds to check the interior after entering. The inner shelf will also restrict the downward reach of any predator paws. The box is so big, though, that birds can easily stay out of reach of any predator paws. I thought of putting the cold frame up on the railing of the rear deck, where in a corner position, the railing would support three corners of the frame, needing only one temporary leg for the last corner -- but my wife vetoed that idea (too unsightly). (It was designed to be portable, in three stackable sections of about 30 pounds each, with a hardware cloth plus porous plastic bottom.) We have no snakes of any kind in this suburban area. Rats and mice are under control, because since I have been killing them, there are no more signs of them trying to tunnel into my shop/storage area, which has a dirt floor. But just in case, I can add a smooth hard material to the back wall of the cold frame so that rodents cannot climb up to the entrance holes. The other possible predators are wandering cats (common) and racoons (rare). The inner shelf/baffle will stop them. I have st least a dozen small plastic pots that I can lay sideways in the cold frame in case some birds would like to roost in them. A bed of leaves and perching branches are the other options to offer. As for the 'wren' nestbox, the downy has enlarged the opening to 1 1/4 inches. I cleaned out old twigs and put a pile of sawdust in the bottom.

Hey Houzz, how do you like spam when you get it? At least you don't see this ad between each post, like you make me see every time. Payment for my contributions, apparently.