Suptropical forest is the warm broadleave which grows along the foothills up to 1000m (3280ft) and higher up 2000m (6560ft). These forests are the richest in bird species. The globally threatened Rufous- necked Hornbill (Aceros nipalensis) found to these forests and these species is still fairly common in Bhutan, it is rare and declining eleswhere in its range. The beautiful Nuthatch ( Sitta formosa ) which is rare and poorly known where it occurs has been found only in Bhutan in warm broadleaved forests.
Amongst species with the restricted ranges, Yellow-vented Warblers (Phylloscopus cantator), White-naped Yuhina (Yuhina bakeri), Broad-billed Warbler (Tickellia hodgsoni) and Rufous-throated Wren Babbler (Speleaomis caudatus) are also found. These forests are also important for the enigmatic Chestnut-breasted Patridge (Arborophila mandellii), which is both internationally threatened and restricted in distribution.
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