Black-crested Bulbul

The black-crested bulbul is a bulbul found from the Indian subcontinent to southeast Asia, 18.5 to 19.5cm long. The head is black with a distinct crest and a yellow iris, the body greenish yellow above and yellow below, and the tail greenish black, with black bill and feet. In the subspecies johnsoni the throat is red (Wikipedia, general species account).

Male and female are alike, and young birds are slightly duller. It is a bird of forest and dense scrub, feeding on fruit and insects, and builds its nest in a bush with a typical clutch of two to four eggs. The source read does not name Bhutan, so its occurrence there is flagged for checking.