In a study on this species in Bukit Barisan Selatan National Park, Sumatra, O?Brien et al. (2004) calculated an average group density of one group for every 2.23 km2, with an average group size of 3.9, and a population estimate of 22,390 individuals. Healthy populations persist at the southern limit of its range in Bukit Barisan Selatan National Park, and these populations should survive over the long-term if the park maintains its present forest area, and if illegal hunting and habitat degradation are stopped (O?Brien et al. 2004). While some populations of this species appear secure today, its future is uncertain and will depend on vastly improved conservation efforts, especially in Sumatra?s remaining parks and protected areas (O?Brien et al. 2004). Population densities for this species range from 2.4 to 24.6 individuals/km2 (O?Brien et al. 2004).
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