The greater racket-tailed drongo is one of the most common birds at Bukit Timah (Dicrurus paradiseus). The drongos often follow monkeys through the forest and eat insects that are exposed by the monkeys' actions. Other bird species include the Asian fairy bluebird (Irena puella), the red-crowned barbet (Megalaima rafflesii) and the common emerald dove (Chalcophaps indica). Bukit Timah is one of only two places in Singapore where the red-crowned barbet is found, the other being the Central Catchment Nature Reserve. The reserve, along with the adjacent Central Catchment Nature Reserve, has been identified by BirdLife International as the Central Forest Important Bird Area (IBA) because it supports populations of vulnerable straw-headed bulbuls and brown-chested jungle flycatchers.