Tiny, cryptic woodland songbird, unique in North America. White below and streaked brown-and-buff above; blends into tree bark very easily. Also note narrow, decurved bill and long tail. In flight, shows a bold buffy wing stripe. When foraging, often starts near the base of a tree trunk, hitches upward in short, jerky motions until it nears the top, then flies to the base of a nearby tree to begin the process again. Found in mature woodland, especially with conifers. Often joins mixed flocks with other songbirds, especially in winter. Listen for high, thin calls and sweet cascading song.