A small, compact rock-thrush with short legs. The male has a gray back and a diagnostic pearly blue-gray crown. Although some individuals (particularly farther east) have darker crowns, they retain the pale eyebrow, always giving the head a two-toned appearance. The female is differentiated from other rock-thrushes by her squat shape and white throat bordered by dark stipples. Pairs and loose groups inhabit rocky country in arid bushlands, where they perch conspicuously on taller bushes, wires, and poles. The male Sentinel Rock-Thrush has a more upright posture than Short-toed Rock-Thrush, with uniform blue-gray head coloration that extends lower on the breast. The male Cape Rock-Thrush is much larger and has a brown back.