Blyth's Paradise Flycatcher

Blyth's paradise flycatcher, also called the oriental paradise flycatcher, is a flycatcher with striking plumage, native to north-east India, Indochina, Sumatra and Borneo, and some populations migrate. The male is dimorphic, appearing in rufous and white forms that both share a dark head, a small triangular crest and a blue eye-ring. The breeding male has elongated central tail streamers nearly twice his body length (Wikipedia, general species account).

Females look like non-breeding rufous males, with a slightly less vibrant blue eye-ring and a paler head. The song is a ringing series of 'wiwiwiwiwi' notes, and the call is a nasal 'ji-jeh'. The source read gives no habitat, diet or breeding detail, and does not name Bhutan, so none is stated.