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Napothera malacoptila
Habitat
Subtropical or tropical moist montane forests
Range
The Himalayas from north-eastern India to southern China
The long-billed wren-babbler is a member of the family Pellorneidae found in the Himalayas from north-eastern India to southern China. Its natural habitat is subtropical or tropical moist montane forest (Wikipedia, general species account).
That short account is the only source read for the Bhutan guide. It does not name Bhutan specifically, and gives no plumage, size, diet or breeding information, so none is stated.