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24. Javan Slow Loris

Nycticebus javanicus


Previously thought to be a subspecies of the Sunda slow loris, the Javan slow loris was classified as a separate species in the 2000s.

Slow lorises produce a toxin in glands on the inside of their elbows which they spread across their bodies while grooming, as well as using it in their painful bites. They are similar to other lorises, as they are nocturnal and arboreal, using vines and lianas to climb. They are the largest of the Indonesian slow lorises.

The main threat facing the Javan slow loris is extensive habitat destruction and fragmentation. Other threats include being captured for use in the pet trade, and to a lesser extent for traditional beliefs and folk medicines. Lorises share common ancestry with ‘primitive’ primates, such as the bushbabies of Africa and the lemurs of Madagascar, with the Lorisidae family having emerged and evolved independently for at least 20 million years.

  • Order: Primates
  • Family: Lorisidae
  • Population: Unknown
  • Trend: decreasing
  • Size: 293mm
  • Weight: 565-687g

EDGE Score

EDGE Score: 5.76 (?)
ED Score: 18.89 (?)
GE / IUCN Red List (?)
Not Evaluated Data Deficient Least Concern Near Threatened Vulnerable Endangered Critically Endangered Extinct in the Wild Extinct


The Javan slow loris is known from provinces of Banten, West Java and at least as far east as the western part of East Java in Indonesia.

Habitat and Ecology

The Javan slow loris inhabit primary and secondary forests, as well as bamboo and mangrove forests, and chocolate plantations. Their diet consists of fruit, tree gum, insects, lizards and eggs.

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This wordcloud illustrates the threats facing this species. The size of each word indicates the extent of a species range that is affected by that threat (larger size means a greater area is affected). The colour of the word indicates how much that threat impacts the species (darker shades of red mean the threat is more severe).

Urban development Crops Hunting Logging Invasive species

Threat wordcloud key:

Small area affected
Large area affected
Least severe
Most severe
Severity unknown
Source: The IUCN List of Threatened Species. Version 2017.1.
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