Identificaciones de gailonbrehm

Here's a puzzler for bird sleuths. This bird had apparently just bathed and was preening amid our Maximilian Sunflowers. Photos were taken at 2:30 pm on a bright sunny, so some foliage color may be reflecting on the bird. I got no clear shots of the wings, so I can't say if this bird had wingbars or not. The tail in photo #3 shows black tips on the underside, but photo #4 makes it look completely yellow. I'm open to correction if you think this bird is some other species.