
Photo: JJ Harrison · CC BY-SA 3.0 (May be cropped or resized)
Pnoepyga pusilla
Habitat
Subtropical or tropical moist lowland and moist montane forest
Range
Southern and eastern Asia from the Himalayas to the Lesser Sunda Islands
The pygmy cupwing, or pygmy wren-babbler, is a member of the Pnoepyga wren-babbler family found in southern and eastern Asia from the Himalayas to the Lesser Sunda Islands. Its natural habitats are subtropical or tropical moist lowland forest and 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.