This morning I observed a first year BLACK-THROATED GREEN WARBLER at Floyd Lamb Park in Clark County. It was seen east of the "bowl area" on the SE side of the largest pond in both mesquite and cottonwoods.
When it first popped out of a smaller mesquite, I thought it might have been a young Hermit Warbler because all the yellow was contained in the face and not extending down into the breast in addition to having a white throat. I then noticed black streaks along the flanks, a bright green back without streaking, and a small amount of diffused yellow in the vent. It foraged manically in several cottonwoods mostly staying high with a flock of Yellow-rumps and Lesser Goldfinches. It chipped once and the chip was duller than what I have heard Townsend's emit. It never really offered any good chances for photos except once, when I got a picture of literally it's butt as it left the branch to take off. When I cropped the pic, it shows a small amount of yellow in the vent or just above the left leg (you might have to squint your eyes). I have added the original pic and the cropped picture for eBird purposes.
As I tired to focus on the bird again, I lost it's position in front of me. Several LEGOs took off to the South, but I was convinced the Green was still foraging with the YRWA flock. However, after searching for another hour and half I think I might have guessed wrong.
Remember to check those Townsend's carefully!