Scientists Say Japanese Monkeys Are Having 'Sexual Interactions' With Deer

Adolescent female monkeys in Japan have repeatedly engaged in sexual behaviors with sika deer, for reasons that are not yet clear, according to researchers who study macaque behavior. The study, published in the peer-reviewed Archives of Sexual Behavior, follows up on a single report from earlier this year of a male macaque mounting a female sika deer on Yakushima Island. That report was intriguing, but a co-author of the new study told The Guardian it was essentially anecdotal. "Even the sexual nature of this interaction was not clearly demonstrated," said Noëlle Gunst, a researcher at the University of Lethbridge in Canada. So she and her colleagues sought to nail down the nature of the mounting. Looking at a different set of relationships — adolescent female monkeys and deer, particularly male deer, in Minoo, Japan — the researchers found interactions that definitely seemed to be sexual in nature. (The female monkeys were climbing onto the deer and grinding their genitals against