Pied Bush Chat

At 13cm, the pied bush chat is slightly smaller than the Siberian stonechat, though it has a similar dumpy structure and upright stance (Wikipedia, general species account).

That is the only usable detail in the source read for the Bhutan guide. No plumage, range, habitat, diet or breeding information was found, so none is stated, and its occurrence in Bhutan is flagged for checking.