Species of bird
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The sulphur-bellied bulbul (Iole palawanensis) is a songbird species in the bulbul family, Pycnonotidae. It is endemic to Palawan (Philippines). Its natural habitat is tropical moist lowland forests.
Description and taxonomy.
Ebird describes it as "A medium-sized bird of forest and edge in the mountains on Palawan. Olive-brown above, blending to a more brownish crown which can be slightly raised into a crest, with a yellow belly blending to an olive chest and a whitish throat. Note the pale orange eye. Somewhat similar to Ash-fronted Bulbul, but has yellow belly and pale eyes. Call is a simple nasal “chewp!”
The sulphur-bellied bulbul was originally described in the genus "Criniger". Some authorities have classified the sulphur-bellied bulbul in the genera "Hypsipetes" and "Ixos". Alternate names for the sulphur-bellied bulbul include the golden-eyed bulbul and olive bulbul. The latter name should not be confused with the species bearing the same name, "Iole virescens"
Not much is known about its diet but it is presumed to be the typical bulbul diet of fruit and insects. Found single, in pairs or small flocks. 
Habitat and conservation status.
Its habitat is primary lowland forest, secondary growth and forest edge. 
It is assessed as least-concern species under the International Union for Conservation of Nature with the population decreasing. Palawan's forests are under threat due to illegal logging, deforestation, land conversion and mining. The whole of Palawan was designated as a Biosphere Reserve; however, protection and enforcement of laws has been difficult and these threats still continue. It occurs in just one protected area in the Iwahig Prison and Penal Farm.
Footnotes.
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