evidence: We detected Giant Nuthatches at 12 of the 42 sample points (28.6%) during a total of 126-point survey sessions that involved a total of 19 detections, across an elevation range of 1,192 to 1,738 m above sea level. The detections at each of the 12 locations were taken to constitute a presumed territory or pair. These were clustered within four major localities (Figure 1), namely, Doi Ang Khang Royal Project Center (two territories), Doi Chiang Dao Wildlife Sanctuary (three territories), Doi Lang (an outlier of the present-day Doi Pha Hom Pok National Park; five territories), and Mae Ngai Watershed Station (two territories). All but four sightings were from within protected areas (national parks or wildlife sanctuaries). In contrast, the nuthatch was not detected during our survey from four historical localities where previously detected during 1930 to 1997 (Doi Inthanon National Park, Doi Langka (on the common border of Khun Chae National Park and Jae Sorn National Park), Doi Pha Hom Pok (the core area of Doi Pha Hom Pok National Park), and Khun Mae Ya Watershed Management Unit (part of Huai Nam Dang National Park; Table 1).