
Photo: (c) Brodie Cass Talbott, some rights reserved (CC BY) · CC-BY (May be cropped or resized)
Ficedula erithacus
Habitat
Subtropical or tropical moist lowland and moist montane forests
Range
Eastern Himalayas, central China and Yunnan; winters in northern Indochina
The slaty-backed flycatcher is a member of the Old World flycatcher family native to the eastern Himalayas, central China and Yunnan, wintering in northern Indochina. Its natural habitats are subtropical or tropical moist lowland forests and moist montane forests (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.