Subtropical forest grows along the foothills up to 1,000 m (3,280 ft.). Higher up, and extending up to 2,000 m (6,560 ft.) is the warm broadleaved forest. These forests are the richest in bird species.

The globally threatened Rufous-necked Hornbill (Aceros nipalensis) is virtually confined to these forests and requires mature fruiting trees. While this species is still fairly common in Bhutan, it is rare and declining elsewhere in its range. Another endangered species, the Beautiful Nuthatch (Sitta formosa), which is rare and poorly known wherever it occurs, has been found only in Bhutan in warm broadleaved forests. These forests are also important for the enigmatic Chestnut-breasted Partridge (Arborophila mandellii), which is both internationally threatened and restricted in distribution.

Amongst species with the restricted ranges, Yellow-vented Warblers (Phylloscopus cantator) and White-naped Yuhina (Yuhina bakeri) are almost confined to subtropical and warm broadleaved forests. These are also the main habitat of the Broad-billed Warbler (Tickellia hodgsoni) and Rufous-throated Wren Babbler (Speleaornis caudatus).

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