Voice includes slightly rising or falling long, alternating whistles, “puuuuui!

piuuuuu!” or a quicker, repeated phrase, “chooit chi-peeet!”[2] This species is monotypic and has no subspecies.

Forest loss, due to legal and illegal logging, mining and conversion into farmland and urban development, is its main threat.

The whole of Palawan was designated as a Biosphere Reserve; however, protection and enforcement of laws has been difficult and these threats still continue.

Conservation actions proposed include surveys of remaining lowland forest to understand its true distribution and population status and to propose key sites as protected areas; to assess its ecological requirements, particularly its sensitivity to habitat modification; to support the extension of Puerto Princesa Subterranean River National Park; and to formally protect the forests of Iwahig Prison and Penal Farm.