There's no place like home

Tony tells me that this is most likely the nest of a warbling vireo.

1) It is a suspended cup. All vireo species build a suspended nest, unlike most other bird species. Orioles build suspended nests, but this is only 3" across and 4" deep. Definitely not an oriole nest, which is much larger and more like a bag than a cup.

2) Of the locally nesting vireos, the plumbeous nests in coniferous forest, the warbling vireo in deciduous. This nest is woven into a cottonwood branch, therefore... it's probably warbling vireo.

Cool.