The hook-billed bulbul (Setornis criniger) is a species of songbird in the bulbul family, Pycnonotidae. It is found in eastern Sumatra and Borneo, where its natural habitats are [subtropical or tropical moist lowland forest](https://bliptext.com/articles/[subtropical](https://bliptext.com/articles/sub[tropical](https://bliptext.com/articles/tropical))-or-[tropical](https://bliptext.com/articles/tropical)-moist-lowland-forest) and subtropical or tropical swamps. It is threatened by habitat loss. Alternate names for the hook-billed bulbul include the long hook-billed bulbul and long-billed bulbul. While currently monotypic within the genus Setornis, originally the genus contained the hairy-backed bulbul (now Tricholestes criniger viridis).