N. larvatus are unique from other primates because of their red, protruding nose (which may be up to 17.5 cm long in males) and pot belly. The name given as Orang Belanda came from the native that inhabit of Borneo to resemble the Dutch Colonialists (Tisdal & Nantha, 2007). The adult males of N. larvatus have a head and body length of 660-762 mm and weight between 16.0 and 22.5 kg (Nowak, 1999). Proboscis monkey are large reddish-brown monkeys with sexual dimorphism. The males and females are sexual dimorphism which they both have different characteristic. Male proboscis monkey have thicker, darker mane of hair across their back; their tail and patch are white in colour while the female are off-white or grey in colour (Bennett, 1986). They also have partially webbed hind feet to help in swimming and walking on mangrove mud. The newborn of N. larvatus can be identified with having sparse, black hair and dark blue face skin (Bennett, 1986).
2.2.2 Habitat and Distribution
Proboscis …show more content…
larvatus which are one-male unit (OMU) and all-male unit (AMU). OMU consisting of one adult male, several adult females and their young while AMU consisting only young males (Murai, 2004). According to Boonratana (2000), some units actively associated with each other and they also can create multilevel society which specific units according to their sleeping sites within two separate bands (Yeager, 1991). Besides, the basic social unit of N. larvatus is a harem group which stable over time. Different groups frequently joined together, next to the river at night. Although the members of one harem remained together, the different groups were contiguous (Bennet & Sebastian, 1988). Groups of N. larvatus frequently met during day and also evening. The pattern of their movement which the groups move independently away from river in morning and travelled independently through forest. They met before the other groups moved away (Bennet & Sebastian,
2.2.2 Habitat and Distribution
Proboscis …show more content…
larvatus which are one-male unit (OMU) and all-male unit (AMU). OMU consisting of one adult male, several adult females and their young while AMU consisting only young males (Murai, 2004). According to Boonratana (2000), some units actively associated with each other and they also can create multilevel society which specific units according to their sleeping sites within two separate bands (Yeager, 1991). Besides, the basic social unit of N. larvatus is a harem group which stable over time. Different groups frequently joined together, next to the river at night. Although the members of one harem remained together, the different groups were contiguous (Bennet & Sebastian, 1988). Groups of N. larvatus frequently met during day and also evening. The pattern of their movement which the groups move independently away from river in morning and travelled independently through forest. They met before the other groups moved away (Bennet & Sebastian,