Pygmy slow lorises are nocturnal, wide-eyed primates that spend most of their time in trees. Native to Vietnam, Cambodia, Laos, and China, their pygmy name is apt. They top out at about 10 inches in length and two pounds in weight, though most weigh about half that.
The “loris” part of their name is also appropriate, coming from an old Dutch word meaning clown. That’s likely due to their natural eye “makeup” looking a little bit like they might be ready to join the circus. These markings surround large eyes that help them hunt their favorite prey – insects and small mammals and birds – in the dark. They also eat fruit, tree gum, and sap.
Unfortunately, this species is listed as endangered on the International Union for Conservation of Nature’s Red List. The main threat? People. Learn more about this unique species that could use our help.
They Have Unique Bodies
The pygmy slow loris has an extra tongue. The larger upper tongue is used to slurp up nectar, while the lower acts as a toothbrush after they’ve finished their meal. Their back is also out of the ordinary. They have extra vertebrae, which allows them to move like snakes.
They’re the Only Venomous Primate
Their slithering movements aren’t the only way they’re similar to snakes. Slow lorises are also venomous, like many of their scaled neighbors. They’re the only primate and one of the few mammals with this attribute. They have a toxic oil located in glands near their elbows. When they lick this oil and it mixes with their saliva, it becomes venom. The venom then spreads to their teeth, producing a dangerous and sometimes deadly bite. Grooming their babies with this venom can also protect them from predators.
They May Fight Dirty
Slow lorises don’t just use that venom to fight off predators from other species. Research has found they most often use it against each other. Anna Nekaris from Oxford Brookes University led a study on Javan slow lorises in Indonesia that involved eight years of observing the species. Her team found that about a third of females and a little more than half of males showed signs of a toxic loris bite. Symptoms include the loss of large patches of skin and fur, and sometimes fingers and toes. Ultimately, the bites can also be fatal.
They Can Be Social, Though
Despite the fact that they’re somewhat solitary in the wild – which isn’t surprising considering the prior fact – when they end up in captivity, they can make “friends.” Pygmy slow lorises are often victims of the pet trade, and when rescued, they can find themselves in zoos or other wildlife rescues. A 2021 studyof six female pygmy slow lorises at the Japan Monkey Centre’s Slow Loris Conservation Centre found that all-female groups are social and prefer to remain close to each other, even when nesting at night. The researchers say this suggests females of the species may seek out companionship when it’s available.
They Snooze in an Endearing Way
Since pygmy slow lorises are nocturnal, they spend the day sleeping in trees. The position is kind of cute, though. They’ll usually sleep curled up into a ball with their heads tucked under their arms. They’ll do this in the hollows of trees, in tree crevices, or on branches.
They’re Also Up for Hanging Out
While they’re up in the trees, they make the most of branches. Though they’re small, they have remarkably strong limbs. They can hang from a branch with their hind legs for hours at a time. They may do this while gathering food. The San Diego Zoosays they avoid having circulation issues in this position due to extra vascular bundles in their limbs that allow blood to flow to their extremities.
