Slow lorises are a group of primates from southeast Asia and possess a very rare trait for a mammal – a toxic bite. This provides defence from predators and mothers also protect their young by licking the toxin onto their fur.
Slow lorises are perfectly adapted to life in the trees with special pincer-like hands and feet. Being nocturnal, slow lorises use scent-marking to communicate with each other and males are highly territorial. Large eyes help them forage in the dark and they eat a wide range of foods from small mammals to tree gum.
Sadly illegal trading and habitat loss mean all species of wild slow lorises are declining.
Scientific name: Nycticebus
Rank: Genus
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Mysteries of slow loris toxin
Expert Kelly Ablard explains why slow loris toxin is so potent.
Expert Kelly Ablard explains why slow loris toxin is so potent.
Natural pesticide
Scientist Anna Nekaris shows toxin from a slow loris can kill parasites such as leeches.
Scientist Anna Nekaris shows toxin from a slow loris can kill parasites such as leeches.
Ingesting poison
Slow lorises may make their poison from the toxic bugs they eat.
Slow lorises may make their poison from the huge variety of distasteful and sometimes toxic insects and spiders they eat.
Poisoning predators
Scientist Anna Nekaris investigates whether toxin from a slow loris can repel large predators.
Scientist Anna Nekaris investigates whether toxin from a slow loris can repel large potential predators such as sun bears.
Poison bath
A slow loris covers her baby in poisonous saliva before heading off to hunt.
A slow loris covers her baby in poisonous saliva before heading off to hunt.
The Slow lorises can be found in a number of locations including: Asia, China, Indian subcontinent. Find out more about these places and what else lives there.
The following habitats are found across the Slow lorises distribution range. Find out more about these environments, what it takes to live there and what else inhabits them.
Discover what these behaviours are and how different plants and animals use them.
Additional data source: Animal Diversity Web
Slow lorises are a group of several species of strepsirrhine primates which make up the genus Nycticebus. Found in South and Southeast Asia, they range from Bangladesh and Northeast India in the west to the Philippines in the east, and from the Yunnan province in China in the north to the island of Java in the south. Although many previous classifications recognized as few as a single all-inclusive species, there are now at least eight that are considered valid: the Sunda slow loris (N. coucang), Bengal slow loris (N. bengalensis), pygmy slow loris (N. pygmaeus), Javan slow loris (N. javanicus), Bornean slow loris (N. menagensis), N. bancanus, N. borneanus, and N. kayan. The group's closest relatives are other lorisids, such as slender lorises, pottos, false pottos, and angwantibos. They are also closely related to the remaining lorisoids (the various types of galago), as well as the lemurs of Madagascar. Their evolutionary history is uncertain since their fossil record is patchy and molecular clock studies have given inconsistent results.
Slow lorises have a round head, narrow snout, large eyes, and a variety of distinctive coloration patterns that are species-dependent. Their arms and legs are nearly equal in length, and their trunk is long, allowing them to twist and extend to nearby branches. The hands and feet of slow lorises have several adaptations that give them a pincer-like grip and enable them to grasp branches for long periods of time. Slow lorises have a toxic bite, a trait rare among mammals and unique to lorisid primates. The toxin is produced by licking a gland on their arm, and the secretion mixes with its saliva to activate it. Their toxic bite is a deterrent to predators, and the toxin is also applied to the fur during grooming as a form of protection for their infants. They move slowly and deliberately, making little or no noise, and when threatened, they freeze and become docile. Their only documented predators—apart from humans—include snakes, hawk-eagles and orangutans, although cats, civets and sun bears are suspected. Little is known about their social structure, but they are known to communicate by scent marking. Males are highly territorial. Slow lorises reproduce slowly, and the infants are initially parked on branches or carried by either parent. They are omnivores, eating small animals, fruit, tree gum, and other vegetation.
All of the slow loris species which had been identified prior to 2012 are listed as either "Vulnerable" or "Endangered" on the IUCN Red List. The three newest species are yet to be evaluated, but they arise from (and further reduce) the ranks of what was thought to be a single "Vulnerable" species. All four of these are expected to be listed at least with the same, if not a higher-risk status. Each of the slow lorises is threatened by the wildlife trade and habitat loss. Although their habitat is rapidly disappearing and becoming fragmented, making it nearly impossible for slow lorises to disperse between forest fragments, unsustainable demand from the exotic pet trade and traditional medicine has been the greatest cause for their decline. Deep-rooted beliefs about the supernatural powers of slow lorises, such as their purported abilities to ward off evil spirits or to cure wounds, have popularized their use in traditional medicine. Despite local laws prohibiting trade in slow lorises and slow loris products, as well as protection from international commercial trade under Appendix I, slow lorises are openly sold in animal markets in Southeast Asia and smuggled to other countries, such as Japan. They have also been popularized as pets in viral videos on YouTube. Slow lorises have their teeth cut or pulled out for the pet trade, and often die from infection, blood loss, poor handling, or poor nutrition.
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