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Alcurus striatus
Habitat
Subtropical or tropical moist montane forests
Range
Eastern Himalayas to northern Vietnam
The striated bulbul is the only species in the genus Alcurus, and is found from the eastern Himalayas to northern Vietnam. Its natural habitat is subtropical or tropical moist montane forest (Wikipedia, general species account).
That short account is the only source read for the Bhutan guide. It gives no plumage, size, diet or breeding information, so none is stated.