This isn't exactly a "backyard bird" unless, that is, your backyard happens to be the Grand Canyon. However, I'm very eager to identify this critter. It and a few companions were perched just over the south canyon rim edge at Yavapai Point, roughly an hour before sunset about two weeks ago. Someone thought it was a Chickadee, but I know that's not correct. Its beak is too long, for one, and the markings are not quite right. I checked my bird books and did not find a likely candidate, so I'm counting someone here to identify this fellow. Thanks.