Rusty-bellied Shortwing

The rusty-bellied shortwing is a member of the Old World flycatcher family found in Yunnan, north-east India and far northern Myanmar. Its natural habitats are subtropical or tropical moist lowland forests, moist montane forests and moist shrubland (Wikipedia, general species account).

That short account is the only source read for the Bhutan guide. It does not name Bhutan, so its occurrence there is flagged for checking, and it gives no plumage, size, diet or breeding information.