Yes — the slow loris is venomous, and uniquely so
Among the hundreds of primate species, the slow loris stands alone: it is the only group known to be genuinely venomous. The question "are slow lorises dangerous?" therefore has a clear answer — to a small animal a loris bite can be deadly, and to a person it can be far more serious than most expect.
How the venom is made
The system has two parts. A gland on the inside of each arm, the brachial gland, produces an oily secretion. When the loris licks that gland, the secretion mixes with saliva and becomes active in the mouth. That is why a threatened loris raises its arms toward its head — it is arming the bite, not asking to be tickled.
What the venom does to humans
The most documented danger to people is allergic. Research has shown the brachial-gland secretion contains a protein closely resembling Fel d 1, the main cat allergen — which helps explain why bites can provoke severe immune reactions. A peer-reviewed case described a person going into anaphylactic shock after the bite of a wild Kayan slow loris, and a survey of people who work with lorises found several who suffered anaphylaxis-like symptoms after being bitten.
Why a venomous primate ends up in the pet trade
The venom is precisely why captured lorises are mutilated. To make them "safe" to handle and sell, traders cut or pull out their teeth with clippers or pliers, without anaesthetic. Many animals die from the resulting infection, blood loss and stress, and a toothless loris can never feed naturally again. It is one of the cruellest details of the trade — and a direct consequence of the animal's most extraordinary trait.
Should you be afraid of slow lorises?
Not in any everyday sense. Slow lorises are shy, nocturnal and want nothing to do with people; bites happen almost exclusively when the animals are handled or trafficked. The danger is a reason to leave them in the wild, never to fear them in it. For the full biology and conservation story, see our slow loris species guide.
WARN-supported rescue centres in Indonesia and Malaysia treat the dental injuries and trauma left by this trade. If that work matters to you, the slow loris appeal is one way to stand behind it.
Read the full Slow loris wildlife guide for the facts, IUCN status and conservation context — or donate to WARN to help fund the local partners protecting this species.
