Crested Bunting

The crested bunting is sparrow-sized, with males having rufous wings and tail on a black body, and females less contrastingly dull brown; both sexes have the distinctive crest. Males have a prominent crest, a yellowish beak and black body plumage contrasting with the rufous flight feathers; females have a shorter crest, dull olive-brown plumage with dark streaks, cinnamon-fringed wing and tail feathers and a grey beak (Wikipedia, general species account).

It was formerly placed in the monotypic genus Melophus because of its crest, unique among buntings, until DNA studies showed it nested within Emberiza. Non-breeding males are buffish grey. It becomes more gregarious in winter, forming flocks that sometimes forage with other finches, buntings and larks, and males sing from atop tall plants in the breeding season. The clutch is three or four white, spotted eggs. The source read does not name Bhutan.