I found this fledgling in an area where both Western and Mountain Bluebirds were nesting...there was a Mountain Bluebird female nearby, and there is a lack of distinct spots on the back of this bird, which led me to the ID.
Comments and critique are welcome as always and thanks for looking!
Canon 50D, 500 f/4 with 1.4x, ISO 400, f/5.6, 1/160sec, +2/3EV, shot from truck using BLUBB
Thanks Axel, I don't even usually check the white balance, almost always leave it as shot...I do know better. Re-post with white balance corrected based on grey feathers on the bird and NR applied to background.