Slow lorises—a small group of wide-eyed, nocturnal primates found in the forests of south and southeast Asia—might look adorable, but think twice before snuggling up to one. They may look harmless, but a slow loris can pack a gnarly bite laced with venom powerful enough to rot flesh.
Scientists have long been fascinated with slow lorises, and until now, they haven’t been able to pinpoint exactly why they have venom or how they use it. However, a new study suggests that slow lorises mainly use their toxic bites in fights against each other instead of defending themselves against other species, reports Liz Kimbrough for Mongabay.
“This very rare, weird behavior is happening in one of our closest primate relatives,” Anna Nekaris, lead author on the study and a primate conservationist at Oxford Brookes University, tells Rachel Nuwer for the New York Times. “If the killer bunnies on Monty Python were a real animal, they would be slow lorises—but they would be attacking each other.”
A bite from a loris is no joke. They have glands underneath their armpits that ooze noxious oil, and when they lick those glands, their saliva combines with the oil to concoct the venom. It fills into their grooved canines, which then deliver a grisly bite strong enough to pierce through bone. The imbued venom causes the victim’s flesh to rot away, and some lorises have even been seen with half their faces melted off, Nekaris tells the Times.
As the only group of venomous primates, slow lorises were already seen as oddities in the animal kingdom, and for decades, scientists debated why a primate would evolve to be venomous. They originally hypothesized that the venom was used to defend themselves from predators or to ward off parasites.
Slow lorises are join an exclusive group of only five other mammals known to use venom against individuals of their own species. The list includes vampire bats, two species of shrews, platypuses and solenodons, which are shrew-like critters found in Central America. Nekaris tells Mongabay that it’s rare for both males and females to have venom and also use it. In species like the duck-billed platypus, males use their venom against each other during mating season.
https://www.smithsonianmag.com/smart-news/adorable-little-furballs-death-slow-lorises-use-their-venomous-bites-against-each-other-180976111/