In Japan, female snow monkeys are frequently engaging in sexual activities with deer. and Scientists aren’t sure why.
Scientists have published a research paper on the behavior after video went viral that showed a snow monkey sexually mounting a sika deer.
They found that monkeys’ predisposition to mount deer, while surprising, was not abnormal. Among the primates, in fact, it’s a cultural action, either a fad or an ingrained tradition.
In study published in the peer-reviewed journal Archives of Sexual Behavior, researchers documented repeated attempts by Japanese snow monkeys, to climb on the backs of deer and thrust their pelvises.
Videos of the interactions don’t show actual sexual penetration because of the anatomical differences between the species. Additionally, adolescent females were humping the cervines. At the same time, both species incidentally have mating seasons.
The researchers are sure that the monkeys’ advances toward the deer are sexual in nature, because the actions resemble the actions of female monkeys toward male monkeys before they mate.
The female monkeys were primarily observed mounting male bucks. It’s unknown whether that’s because female deer and juveniles would buck them off, or because the monkeys actually had a sexual preference for stags.
The scientists documented interactions between Japanese macaques, also known as snow monkeys and their sexual partners. They reveal that Japanese snow monkeys have no preference between sex within their own species. There was no difference in how long the monkeys spent on top of their partner of either species, but they did prefer doggy-style with the deer. For their part, the deer didn’t seem to mind.