Some monkeys in Gombe National Park don't seem to mind if the monkey they're mating with is not their own species. Instead, "promiscuous" red-tailed and blue monkeys are coming together and making ...

Breaking up is hard to do -- and can be detrimental to one's reproductive fitness, according to a new study. Focusing on wide-eyed, nocturnal owl monkeys, considered a socially monogamous species, the ...

Scientists caught a male Japanese macaque red-butted (so to speak) trying to mate with several female sika deer. In the video, a few of the deer try to shake the little monkey off, but others just ...

A new study of guenon monkeys in Gombe National Park is the first to provide genetic evidence of ongoing mating between two distinct species. These monkeys have successfully been producing hybrid ...

A male monkey in Japan has been filmed trying to mate with a female deer—likely the first observation of two distantly related species having a nonviolent sexual encounter. Japanese macaques and sika ...

A male Japanese monkey has been filmed trying to mount and mate with a Sika deer. Researchers saw the primate attempting to mate with at least two deer in November 2015, during the macaque breeding ...

The ex-fugitive primate known as the Mystery Monkey of Tampa Bay may soon be putting his lonesome journey behind him. Zoo officials at Dade City's Wild Things have located a female monkey that they ...

One of Africa's rarest monkeys likely interbred with baboons in its past, new genetic research suggests. The large monkey called Rungwecebus kipunji, or kipunji for short, was only discovered in 2003, ...

You’ve heard the saying: Size matters. Of course, it depends on what you’re talking about — and whom you’re talking to. But for male proboscis monkeys from Malaysia, it turns out that having a bigger ...