The proboscis monkey is protected by law (4), and is listed on Appendix I of the Convention on International Trade in Endangered Species (CITES), banning international trade (3). This species is found in at least a dozen protected areas (2). Recently, a vital area of wetland in Sabah has been designated as a sanctuary for a wide range of endangered species such as Asian elephants (Elephas maximus) and orang-utans (Pongo pygmaeus) as well as proboscis monkeys; this area is the Kinabatangan Wildlife Sanctuary (4). However, even this corridor is currently fragmented by plantations, which proboscis monkeys cannot cross (4). The protection of remaining tracts of contiguous habitat is therefore vital for the survival of this unusual looking monkey.