A peek outside the door revealed a nest under construction. I give the wrens high marks for energy (as always) but rather a low grade for nest design. It looks like a small, sloppy leaf pile. Perhaps wrens prefer comfort to style. A quick look in Charlotte Hilton Green's "Birds of the South" confirms the impression - the author notes that "wren families have been raised in the pockets of old coats, in old cups, broken gourds, discarded basins."
An attractive brown with yellow breast, the Carolina wren usually has an upturned tail as it perches or hops around investigating. I often identify its singing simply by sheer volume - as the Cornell Laboratory of Ornithology says, it has "one of the loudest songs per volume of bird." It seems to have dozens of different songs, which it sings like a stage pro, with head thrown back and beak opened wide.
So I'll make the trade - lunches on the back porch in the shade of the umbrella for the pleasure of watching these little birds raise a family. Not too difficult a decision, as rains of the last week produced a side effect - mosquitoes.