Its forehead has a prominent white diamond pattern, which consists of a distinct stripe that runs over its head and forks towards the eyes and ears.

The Javan slow loris population is in sharp decline because of poaching for the exotic pet trade, and sometimes for traditional medicine.

The Javan slow loris (Nycticebus javanicus) was first described scientifically in 1812, by the French naturalist Étienne Geoffroy Saint-Hilaire.

[8] It was first recognized as a distinct species again in a 2000 Indonesian field guide on primates by Jatna Supriatna and Edy Hendras Wahyono.

[9] In 2008, Groves and Ibnu Maryanto promoted it to species status, based on an analysis of cranial morphology and characteristics of pelage.

[11] Due to its close resemblance to neighboring slow loris species, even rescue centers have been known to misidentify it.

Its face and back are marked with a distinct stripe that runs over the crown and forks, leading to the eyes and ears, which leaves a white diamond pattern on the forehead.

In addition to detailing the organization, shape, and measurements of its brain, he noted that the form and surface markings were comparable to that of lemurs.

In 2008, they were observed in West Java to occupy mixed-crop home gardens, tolerating high levels of human disturbance.

[21] The Javan slow loris is listed by the International Union for Conservation of Nature (IUCN) as "critically endangered," primarily due to a rapid decline in population.

In Indonesia, it is sometimes used in traditional medicine, because of myths of it having magical and curative properties, but it is more frequently sold as an exotic pet.

[1][26] The species is easily captured because of its slow movement, nocturnal habits, and its tendency to sleep on exposed branches.

Captive collections of the Javan slow loris can be found in Prague, Czech Republic, Jakarta, Indonesia, and Singapore.

[1] On Java conservationist working for the Little Fireface Project have built a network of mid-air walkways to enable Javan slow loris to move between treetops in areas where land has been cleared for farming.