The subtropical forest thrives at elevations ranging from the foothills to 1,000 m (3,280 ft.), while the warm broad-leaved forest can be found at elevations from 1,000 to 2,000 m (3,280 to 6,560 ft.). These warm broad-leaved forests boast the greatest variety of bird species, making them a crucial habitat for many unique and endangered birds.
The Rufous-necked Hornbill, a globally threatened species, is found almost exclusively in these forests, relying on mature fruiting trees for survival. Although this species is still abundant in Bhutan, it is becoming increasingly rare elsewhere in the world. The warm broad-leaved forests are also the only known habitat of the Beautiful Nuthatch, a species that is both rare and poorly understood. In addition, the Chestnut-breasted Partridge, which is both internationally threatened and has a restricted distribution, is also found in these forests.
Species such as the Yellow-vented Warbler and White-naped Yuhina are almost entirely confined to the subtropical and warm broad-leaved forests, which also serve as the main habitats for the Broad-billed Warbler and Rufous-throated Wren Babbler. These forests are truly a treasure trove of biodiversity and are an essential part of Bhutan’s rich and diverse ecological landscape.