Distribution and conservation status of the orang-utan (Pongo spp.) on Borneo and Sumatra: how many remain?

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Orangutan Energetics and the Influence of Fruit Availability in the Nonmasting Peat-swamp Forest of Sabangau, Indonesian Borneo (2010, background): “…scores (rather than their true score of zero), to distinguish them from months in which no samples were collected (which have no bars and, hence, appear as having a ketone score of zero). world’s largest remaining contiguous orangutan population (Morrogh-Bernard et al. 2003; Wich et al. 2008).”
The orangutan–oil palm conflict: economic constraints and opportunities for conservation (2009, background): “individuals, and these populations are found in a mix of lowland dipterocarp and peat swamp forests that range between 1,000 and 6,500 km 2 in size ( Wich et al. 2008 ).”
Conserving Southeast Asian forest biodiversity in human-modified landscapes (2010, background): “In addition, major roads increase the probability of direct mortality due to vehicular traffic and provide greater accessibility to poachers targeting threatened mammals (e.g., Mohd Azlan, 2006; Mohd Azlan and Lading, 2006; Pattanavibool and Dearden, 2002; Wich et al., 2008).”