The Slow Loris: Facts about The World’s Only Venomous Primate and Victim of the Illegal Pet Trade
Friday, 12 June 2026
Did you know that when it feels threatened, a slow loris can
stay motionless, gripped onto a single branch, for hours? That isn’t the only
remarkable fact about this animal, which is endangered. Their single biggest threat is us – you can
obviously see the attraction from the picture of the Javan Slow Loris above – and in their own habitat they are often taken as
“living toys” for children. They are
also victims of the international global animal smuggling network and videos of
them in captivity often get hundreds of thousands if not millions of hits. They
look very passive and docile in the videos – and do you know why that is? It is because their defense mechanism is to
freeze – so what you are seeing in these videos is not a slow loris happily joining
in the fun, but an animal that is so scared that it has become motionless. Image
The video below is a TED-Ed Lesson by Stephanie A. Poindexter, directed by Reza Riahi and it focuses on the life of the slow loris in the wild, looking at when they diverged from other primates (an awfully long time ago) and how that defensive mechanism works when they are confronted with danger. Although they are omnivores, they also love to eat tree gum – and it is thought that they sequester the toxins from the gum for their own use. They are venomous – the only primate to hold that particular badge, and one of the few venomous mammals in existence. They secrete the toxin from their armpits, mix it with their saliva and spread it on their teeth, so when they bit another animal, it will start a flesh-rotting process almost immediately. They also spread it all over their coats, which makes it a highly effective anti-parasite balm. Some animals (like cats and civets) hate even the vaguest smell of slow loris saliva, so you can see how their venom has multiple uses.
So, if a slow loris ever adopts its venom pose (the very cute
hands above its head that so many people think is the slow loris joining in the
fun), accompanied by swaying and throaty noises, make a quick exit. However, the “people” who work in the illegal
trade of the slow loris do something unspeakable – they file down their teeth
so the venom cannot be carried that way, or they remove the teeth altogether
before selling the wretched animal on. It is mind-boggling to think that people
want to keep slow loris as pets given the suffering that they go through and,
let’s face it, that they are still potentially venemous. Having said that,
wildlife researchers have revealed that the biggest victim of slow loris venom
is, wait for it, other slow lorises.
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