Proboscis Monkey (Nasalis larvatus)

Overview

Proboscis Monkey (Nasalis larvatus) mother and infant in Tawau mangroves

The Proboscis Monkey is a Bornean endemic primate, easily recognizable by its large, pendulous nose and reddish-brown fur. It is primarily found in coastal mangroves and riverine forests, including areas around Tawau.

These unique primates are classified as Endangered due to habitat loss and mangrove deforestation. They play a vital role in their ecosystem as seed dispersers and indicators of mangrove forest health.

Habitat & Ecology

Male Proboscis Monkey showcasing its distinctive nose

Proboscis Monkeys are highly adapted to riverine and mangrove ecosystems. They are excellent swimmers and can often be seen crossing rivers. Mangrove roots provide shelter and abundant food sources, including leaves, fruits, and seeds.

• Preferred areas: lowland rivers, estuaries, and mangrove forests.
• Social structure: live in groups of 10 - 20 individuals, led by a dominant male.
• Activity: mostly active during the day, resting at night in tall mangrove trees.
• Adaptations: webbed feet for swimming, large stomachs for digesting fibrous leaves.

Behavior & Diet

Female Proboscis Monkey foraging for food

These monkeys are folivorous, feeding mainly on leaves, fruits, and seeds. Their large stomachs allow them to digest fibrous leaves efficiently. They are often seen jumping between mangrove branches or swimming across rivers to forage.

Proboscis Monkeys have a specialized digestive system with a multi-chambered stomach that ferments plant material, similar to that of cows. This adaptation allows them to extract maximum nutrients from their leafy diet.

Distinguishing Uniqueness: Proboscis vs. Red Leaf Monkey

Proboscis Monkey	Red Leaf Monkey
Nose: Large, pendulous nose (especially in males)	Small, flat nose
Habitat: Mangroves, rivers, estuaries	Hill & dipterocarp forests
Body: Pot-bellied, webbed feet, strong swimmers	Slim, agile climbers
Diet: Leaves, fruits, seeds (fibrous digestion)	Tender young leaves, shoots
Social Calls: Loud honks & nasal sounds	Softer calls, less resonant

Where to See Proboscis Monkey in Tawau & East Coast

If you're hoping to catch a glimpse of these remarkable primates in their natural habitat, here are the best locations in the Tawau region:

• Kuala Tawau mangroves - Frequent encounters along tidal waterways during early morning or late afternoon.
• Pulau Sebatik mangroves - Occasional river-crossing groups can be observed from boat tours.
• Kinabatangan River (Sandakan region) - Larger populations along riverbanks, especially near Sukau.
• Tawau Hills Park - While less common, occasional sightings have been reported in riverine areas of the park.

For the best viewing experience, consider joining guided wildlife tours led by local ecotourism operators who follow ethical wildlife viewing practices.

In the lush forests of Tawau, a remarkable community of mammals thrives, each uniquely adapted to its environment. The gentle Borneo pygmy elephant, Sabah's largest land mammal, roams widely, depending on vast, connected forests for its survival. High in the canopy, orangutans swing gracefully from tree to tree, their intelligence and role as seed dispersers ensuring the rainforest's renewal. Along the mangroves and riverbanks, the endemic proboscis monkey, with its distinctive pendulous nose and reddish-brown coat, adds character to Tawau's waterways. Hidden deeper in the forest, the elusive Malayan sun bear - the smallest bear in the world - searches for food and shelter, relying on continuous stretches of healthy woodland. Together with clouded leopards, civets, deer, and countless smaller mammals, these creatures form a living tapestry that makes Tawau's forests one of Borneo's most vibrant sanctuaries.

Proboscis Monkeys in their natural mangrove habitat

Conservation Efforts & NGOs

The conservation of Proboscis Monkeys in Sabah thrives through the synergy of research, academia, and grassroots action. Multiple organizations and individuals are working together to protect this endangered species.

Henry Bernard & John Sha

Researchers documenting Proboscis population status and threats in East Sabah, ensuring conservation strategies are grounded in evidence.

Joseph Tangah & Team

Universiti Malaysia Sabah researchers studying isolated Proboscis populations and mangrove degradation impacts, highlighting ecological consequences of habitat fragmentation.

The Proboscis Monkey is listed as Endangered due to habitat loss and mangrove deforestation. Local initiatives in Tawau include:

• Sabah Wildlife Department - Leads the Proboscis Monkey Action Plan 2019 - 2028, supported by Danau Girang Field Centre and Yayasan Sime Darby.
• 1StopBorneo Conservation - Active in Tawau, focusing on mangrove protection and community awareness.
• Wildlife Sanctuary Sabah - Mangrove restoration and replanting projects.
• Community-based groups - Local fishermen and youth groups replant mangroves along Tawau River estuary.

Tawau's local volunteers bring conservation to life through mangrove replanting and awareness campaigns. Their work fosters respect for the monkeys as neighbors rather than tourist commodities, embedding conservation within community values.