One thing though: House wrens are also little monsters. They often do NOT tolerate other songbirds nesting in the area. They are infamous for sneaking up to other songbird nest and puncturing (with their sharp bill) the eggs that are laid therein.
Yes, it sounds gruesome, but apparently the strategy works: the other songbird nest will fail (or else they will move on) and the wren will have all the limited resources of your yard to itself.
I always tell people it's a bird-eat-bird world out there. If we really knew what went on behind the scenes, we'd be mortified! Lol!
"Males choose several prospective nesting cavities and place a few small twigs in each. Female inspects each, chooses one, and finishes the nest building"
That appears to be exactly what happened. Evidently the female didn't want to live in a condo community despite the attractiveness of it. Guess she wanted a pool and clubhouse too........LOL!
Thanks!
And aside from the ‘bird eat bird’ factor, you have the daily fist-fights at the feeders. Not so much with the little darling 4 — Chickadees,Titmice,Nuthatches and Downies, but the House Finches are squabblers to the nth degree! They not only go after the others, but even amongst themselves, they are always at it!