Warbling Vireo nest

Bird songs were at high volume in the riparian forest along the Willamette River today, and that's how I found this Warbling Vireo nest. I watched the bird sing its way through the Cottonwood branches to within a few inches of this clump of leaves. Its sudden silence and disappearance made me take a closer look, and there was the tightly woven cup shielded from sun and rain by a few large leaves.