The Slow Loris: Meet The Big-Eyed, Pint-Sized Primate Endangered For Being Cute

Published March 28, 2020

The slow loris is one of the world's most endangered animals due to deforestation and its being hunted down and illegally trafficked as an exotic pet.

The Slow Loris
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Loris Eating
Loris Sticks Out Tongue
The Slow Loris: Meet The Big-Eyed, Pint-Sized Primate Endangered For Being Cute
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There's no denying the adorability of their saucer-like eyes, cute little faces, and soft fur. However, the slow loris is not having as much fun as it looks. They are being driven to extinction and essentially tortured, thanks to some online videos that appear harmless at first.

We see people that appear to be keeping these primates as pets and tickling them so they raise their arms into the air. It's pretty cute until you realize that the slow loris is not, in fact, loving it. They are attempting to deploy a defense mechanism that has lost its effectiveness for a very sad reason.

The slow loris the only venomous primate in the world, and stores its venom in a pair of brachial glands in its elbow. When threatened, it raises its arms high above its head, extracts the venom from the gland, then uses it to deliver a toxic bite. Illegal online sellers of these endangered primates remove the loris' teeth before the sale as pets and they often do so with nail clippers or wire cutters — and without anesthesia.

"The only reason the loris isn't biting the person holding it in the video is because it has had its teeth ripped out with pliers," said Chris Shepherd of Traffic Southeast Asia, which campaigns against the illegal sale of primates.

Increased demand for the slow loris means poachers are capturing them in the wild, taking away part of their natural rainforest defenses, and selling them to people who then almost always mistreat them, feed them poor diets, and cause the animal constant stress.

Tragically, cuteness has turned out to be a curse for this poor animal.

Slow Loris Basics

Light Gray Loris Eating

Vladimir Buynevich/Flickr
A light gray slow loris.

These primates mainly call southeast Asia home, residing in tropical rainforests, semi-evergreen forests, and swampy forests. In the wild, they average a lifespan of about 17 years. They are six to ten inches in length and weigh about one pound or less.

Usually, the first thing noticed about a slow loris is its eyes. It's one of the features that endear us to the animal, as big eyes have a hard-wired association in our brains with infants. Evolutionarily speaking, we can't help but be drawn to them.

They are nocturnal, so they hunt and forage at night. Those large, forward-facing eyes help the slow loris find food in low light conditions and give it excellent depth perception, essential for navigating tree limbs. They also have a reflective layer of eye tissue called the tapetum — a tissue that cats' eyes also have.

Their fur is short and dense and is colored from grayish to light brownish to deep brown. White and black accents appear on the face, and chests are usually white as well. Most don't have much of a tail to speak of, but if they possess a small nub of one, it's usually covered by fur.

Slow lorises have dexterous hands and opposable thumbs, and the arboreal animals spend almost all their time hanging around in trees. In fact, they can hang still there for hours. They have extravascular bundles in their extremities — called retia mirabilia — which allow for greater circulation. In short, their arms and legs don't fall asleep.

When not hanging or slowly crawling from branch to branch, lorises sleep in the daytime rolled up snug in a ball.

Of course, trees are where the food is; fruits and gums make up for close to 70 percent of their diet. Insects and other small prey make up for the rest. Oddly, they do not eat any leaves, but will occasionally lick them for their moisture.

Defenses, Mating, And History

Slow lorises are one of the cutest primates on earth, a fact that has driven the poor animal close to extinction thanks to both careless and ruthlessly cruel humans.

The slow loris' intricate defense system is four-fold. They employ crypsis, which is the ability to avoid being detected by other animals and predators. Ways to do this are by camouflage or mimicry — such as hanging very still off a tree limb — and by being most active at night.

They are known to raise their arms over their head to mimic the expanded hood of a striking cobra. This act is assisted by the fact that they have extra vertebrae and can move in a more snake-like fashion when they need to really emphasize this threat. They also emit a strong odor when provoked that suggests they are not pleasant to eat.

Furthermore, as mentioned, the slow loris also has a venomous bite that uses secretions from its brachial glands that mix with its saliva. This bite can cause anaphylactic shock — even death — in humans.

Females sometimes "park" their babies for safety by mixing up their venom secretion and licking the babies' fur. This helps keep predators at bay while the moms are busy foraging. Slow lorises have single or twin births, but with twins, one baby is oftentimes not as large or healthy as the other and dies.

Lorises are not immune to their own species' venom. If they are bitten by another slow loris in a fight, they will likely die.

The international trafficking of slow lorises began when 18th-century Dutch explorers brought home lorises from their voyages to southeast Asia. The species likely got its name from the Dutch word loeris meaning clown. However, if this name was given because of the loris's markings or behavior is unknown.

Tickling Is Torture

A short video on the illegal and torturous trade of the slow loris by the advocacy group International Animal Rescue.

The International Animal Rescue (IAR) founded the "Tickling Is Torture" campaign to raise awareness about what's happening to the slow loris. In addition to causing enormous stress in the animals, the viral videos of human tourists tickling or otherwise "playing" with the animal are making people think that its ok to purchase one as a domesticated pet, something that is definitely illegal.

While the lorises in these videos may appear fine, they are actually suffering — as is the entire species. The slow loris is in danger of extinction and individual people and human activity more broadly are most definitely to blame.

Unfortunately, slow lorises are also slaughtered in Cambodia as a folk-cure for stomach issues, broken bones, and even sexually transmitted diseases. There is absolutely no scientific evidence that these "cures" help any human ailments. Lorises are also losing their habitats to deforestation, especially in their native Vietnam, making them even more vulnerable to exploitation.

But mostly, these animals are the victims of illegal trafficking. Slow lorises with clipped teeth cannot be released back into the wild because they are unable to hunt. IAR has a rescue center on the island of Java for slow lorises who are rescued from poachers or neglectful, illegal owners.


Now that you've read about the sad plight of the slow loris, prepare to be fascinated by 29 of the weirdest animals in the world. Then, check out our gallery of Australian Quokkas, the endangered, smiling marsupial which Australia hopes to protect with a selfie-driven internet marketing campaign.

Erin Kelly
Erin Kelly is a freelance writer, artist, and video editor that splits her time between the humid Midwest and the dusty corners of her mind.