
Photo: Imran Shah from Islamabad, Pakistan · CC BY-SA 2.0 (May be cropped or resized)
Phoenicurus frontalis
Habitat
Temperate forests
Range
Breeds in central China and the Himalayas; winters in the southern foothills, southern Yunnan, the Patkai and northern Indochina
The blue-fronted redstart is a member of the Old World flycatcher family. It breeds in central China and the Himalayas, wintering in the southern foothills as well as in southern Yunnan, the Patkai and northern Indochina. Its natural habitat is temperate forest, and the female is brownish grey with paler underparts (Wikipedia, general species account).
That short account is the only source read for the Bhutan guide. It does not name Bhutan, and gives no male plumage, size, diet or breeding information, so none is stated.