In lemur society, it's not males but the females who are in charge. A new study of the role of hormones in aggression in lemurs from before birth to adulthood suggests female domination gets wired early, while lemurs are still in the womb.

Researchers have developed an animal model to test HIV infection and therapies in infants, allowing them to develop biomarkers to predict viral rebound after antiretroviral therapy (ART) interruption. The simian-human immunodeficiency virus (SHIV)-infected infant rhesus macaque model is a collaborative effort among researchers at several institutions.

The language of Old World monkeys, some of our primate cousins, may be more sophisticated than previously realized. Even so, it displays constraints that reinforce the singularity of human language, according to a new study.

Many people turn to the Internet to find a Mr. or Ms. Right. But lemurs don't have to cyberstalk potential love interests to find a good match -- they just give them a sniff. A study of lemur scents finds that an individual's distinctive body odor reflects genetic differences in their immune system, and that other lemurs can detect these differences by smell. The ability could help their offspring fight more pathogens, researchers say.

The cryoEM structure of a simian immunodeficiency virus protein bound to primate proteins shows how a mutation in early humans allowed our ancestors to escape infection while monkeys and apes did not. SIV's Nef protein forms a solid link between two primate proteins, tetherin and AP-2, forcing the destruction of tetherin, which normally prevents new SIV virions from budding off. A mutation in human tetherin disrupted binding, thwarting SIV budding -- until HIV evolved a work-around.

People typically sleep seven to eight hours in one stretch and stay awake for the rest of the day. Evolutionary scientists have assumed that this rhythm of sleep arose when our early ancestors went from being nocturnal to diurnal, but a new study of the Javan slow loris indicates that the human way of sleeping is much older.

More than half of the 147 tigers confiscated from a controversial Thai temple have died, park officials said Monday, blaming genetic problems linked to in-breeding at the once money-spinning tourist attraction.

Menacing macaques snatch bags of crisps, water bottles, cookies and crackers from uneasy tourists on Vietnam's Monkey Island, a popular attraction decried as cruel by activists calling for an end to animal tourism in Southeast Asia.

The most crucial population of a critically endangered monkey—found only in northern Vietnam—has virtually trebled in number since Fauna & Flora International (FFI) and partners first came to its rescue, according to the results of the latest survey.

If you want to conduct groundbreaking but contentious biological research, go to China. Last year, Chinese scientist He Jiankui announced he had created the world's first gene-edited human babies, shocking the world at a time when such practice is illegal in most leading scientific nations. More recently, US-based researcher Juan Carlos Izpisua Belmonte revealed he had produced the world's first human-monkey hybrid embryo in China to avoid legal issues in his adopted country.