Vertebrate fauna of SE Asia
  

 

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Text and photos by Nick Baker, unless otherwise credited.
Copyright ゥ Ecology Asia 2020

 
 
     
   
   

 

   
   
 
Proboscis Monkey
   
   
Fig 1
 
ゥ  Dave Haylock

Fig 2


Fig 3


Fig 4
 

 

 

 

 

Order : PRIMATES
Family : Cercopithecidae
Species : Nasalis larvatus

Head-body length, male : 55-65 cm
Head-body length, female : 55 cm
Tail length, male : 67-75 cm
Tail length, female : 57-62 cm
Weight, male : 12-23 kg
Weight, female : 10 kg  

A unique species, the Proboscis Monkey is unlike any other primate with its extraordinarily large nose. The function of the nose is not known, but it is particularly pronounced in adult males. The fur colour is predominantly light grey to pale orange, and adult males appear to wear a dark brown 'waistcoat'. Both males and females have a reddish brown crown and white chin.

Their preferred habitats are riverine forest and mangrove. During the early morning or late afternoon they are active in trees lining the water's edge, usually with a large male carefully watching over the group.

Endemic to Borneo, the Proboscis Monkey inhabits coastal forests in many areas and can easily be seen in Brunei Bay, and the Kinabatangan River Sanctuary, Sabah, Borneo.


Fig 1 : Male Proboscis Monkey on the foreshore at Bako National Park, Sarawak, Borneo.  Photo thanks to Dave Haylock. 
 

Fig 2 : Female in forest canopy at Telok Paku, Bako National Park, Sarawak, Borneo.

Fig 3 : An adult male keeps watch over its troupe at Kinabatangan River, Sabah, Borneo.

Fig 4 : Side profile of adult male, and rear view of its 'waistcoat'.  Kinabatangan River, Sabah, Borneo.


References : M2