Considered by some authors to be a subspecies of Javan Bulbul (Ixos virescens). References See References. Files: More Information Articles about the Sumatran Bulbul If you would like to read any articles about the Sumatran Bulbul... Show Articles (0) No Pictures of Sumatran Bulbul If Birdpedia has no pictures of Sumatran Bulbul or you would like to see more, then try the following... From BING (0) No Videos of Sumatran Bulbul If Birdpedia has no videos of Sumatran Bulbul or you would like to see more, then try the following.. From BING (0)