
Photo: (c) Thibaud Aronson, some rights reserved (CC BY-SA) · CC-BY-SA (May be cropped or resized)
Oriolus tenuirostris
Habitat
Subtropical or tropical moist lowland and montane forest
Range
Eastern Himalayas to Southeast Asia
The slender-billed oriole is found from the eastern Himalayas to Southeast Asia. Its natural habitats are subtropical or tropical moist lowland forests and montane forests (Wikipedia, general species account).
That short account is the only source read for the Bhutan guide. No plumage, size, diet or breeding information was found, so none is stated, and the entry is kept as short as the evidence allows.