Wallcreeper

The Wallcreeper is a compact mountain passerine, 15.5–17 centimetres long and weighing 17–19 grams. Most of the plumage is blue-grey, contrasting with darker flight feathers and tail. Its most distinctive feature appears when the wings open: vivid crimson panels marked with white spots. Breeding males have a black throat blending into the grey breast; females may show a white throat or a smaller dark patch, and both sexes have white throats during autumn and winter. (Wikipedia, Wallcreeper account)

This is the sole living species in both Tichodroma and the family Tichodromidae, ranging through high mountains from southern Europe to central China. It breeds on steep rocky faces at elevations that vary by mountain system, reaching 2,800–4,000 metres in the Tien Shan and still higher in the Himalaya. Many birds remain within the broad range but descend in winter, when cliffs, quarries, buildings, viaducts, and even cathedrals can substitute for alpine rock faces. Both sexes sing, especially around territories. (Wikipedia, Wallcreeper account)