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  Text and photos by Nick Baker, unless otherwise credited.
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Banded Leaf Monkey
   
   

Fig 1


Fig 2


Fig 3


Fig 4


Fig 5


Fig 6


Fig 7


 

Order : PRIMATES
Family : Cercopithecidae
Species : Presbytis femoralis

Head-body length : up to 59 cm
Tail length : up to 76 cm
Weight : maximum approx. 7.5 kg

The Banded Leaf Monkey Presbytis femoralis inhabits primary forest, mature secondary forest or swamp forest. It is active by day, particularly in the morning and late afternoon, and is mainly arboreal (though in some parts of Thailand the species is known to descend to the ground). Its diet includes new leaves, and forest fruits.

This species is generally shy in nature : males will quickly alert their troupe to the presence of any threat, including the presence of humans, with a loud repetitive ''chi-chi-chi' call, and the troupe will quickly move away to a quieter area.  Troupes generally number up to 5 or 6 individuals, and adult males may be solitary.

Their dorsal fur is dark grey-brown to blackish, and the underside is paler. The face is darker than most other species of leaf monkey, though the upper and lower lips are generally pale. The inner part of the thigh is white. Infants can be locally white or beige in colour.

The species has a disjunct distribution and three subspecies are now recognised : P. f. femoralis (see photos) occurs in southern Peninsular Malaysia (Johor) and Singapore, P. f. robinsoni occurs in southern Thailand and northern Peninsular Malaysia, and P. f. percura occurs in parts of eastern Sumatra.

The Singapore population of P. f. femoralis is considered to be highly endangered : based on studies in early 2010 it is estimated there are only around 40 to 60 individuals surviving.


Figs 1 to 3 : Specimens of P. f. femoralis from Panti Forest, Johor, Peninsular Malaysia.

Fig 4 : Family group, including a young infant at the edge of Singapore's central forests. The infant is reaching out to grasp a fresh leaf.

Fig 5 : This infant is still sufficiently young to have pure white fur on its chest and belly.

Fig 6 : Adult leaping across the gap between two trees. Singapore.

Fig 7 : A young adult has a peaceful encounter with a Long-tailed Macaque at Lower Peirce, Singapore.


References : M3, M5

Videos :
Banded Leaf Monkey consuming leaves of the Saga tree, at Lower Peirce, Singapore.