Being largely restricted to primary forests and intolerant of habitat conversion, the species is additionally threatened by hunting. Trend justification An analysis of deforestation between 20 estimated forest loss within the species's range at a rate equivalent to 35% over three generation lengths (42 years) (Tracewski et al. In Sabah, Crocker Range Park and Tawau Hills Park had population densities of 0.94 individuals/km 2 and 5.67 individuals/km 2 respectively (Lakim & Biun 2005). In Sarawak, Upper Baram and Batang Ai National Park had population densities of 0.27 individuals/km 2 (Chin & Jantan 2001) and 0.96 individuals/km 2 (Meredith 1995) respectively. In Kuala Lompat (Krau Wildlife Reserve) the population density was 2 individuals/km 2 (Medway & Wells 1971). In Peninsular Malaysia, Sungai Tekam Forestry Concession (Pahang State) population density was found to be 1.6 groups/km 2 in primary forest and 2.3, 1.8, 1.2, 0.4 groups/km 2 in 0-6 month, 1-2 year, 3-4, 5-6-year-old logged forest respectively (Johns 1987). The species is widespread throughout its range, but occurs at low densities, even in suitable habitat (Poonswad et al. ![]() ![]() Population justification The population size of this species has not been quantified. The species is thus suspected to undergo a large population reduction over the next three generations. Even though the species is widespread within its range, high hunting pressure is exacerbating the population decline caused by habitat loss. Justification of Red List Category This species is largely restricted to extensive tracts of primary evergreen forest within a region experiencing high rates of deforestation.
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