(near Sedalia, CO)
Very light grey, with white throat/breast. Guessing 7 - 8 inches head to tail. Black malar stripe. At first I thought "black eye stripe" then "a black eye stripe and a white eyestripe." Then noticed the black stripe curved down into bridled. Dark beak. Several of these birds were sitting on snow piles and foraging on the ground in the unpaved parking of a horse stable near Elizabeth, Colorado. They were not spooky. Flew low and swoopy and made a high short "hweet" sound in flight, similar to a Wheatear. Fan-shaped pale grey tail with no markings and rounded wings, also no markings. A beautiful shape in flight and landing.
They resembled the bridled titmous, but larger, I think, and no crest, although I thought I saw a bit of crest rise a very few times. Maybe more like sage sparrow, but all grey, no brown.
I cannot find this bird in Sibley's or Audubon or using iBird Pro.
I hope someone here can help!