A small study of macaques finds they don’t develop a coronavirus infection the second time they are exposed, supporting the idea of using plasma from recovered patients as a treatment for COVID-19.

The inner ear cavity proves to be a useful tool for studying the evolutionary relationships among monkeys, apes, and humans.

Oxidative stress associated with aging damages ovarian cells in both humans and nonhuman primates.

The auditory cortices of humans and rhesus monkeys respond very differently to harmonic tones.

The seven primates came into contact with a dye that was used on their mothers, documents reveal.

Rhesus monkeys engineered to express a human gene reportedly show delayed brain development and better short-term memory. Fellow scientists are raising ethical red flags.

Nearly 50 years after its development, only a handful of creatures have passed the self-awareness exam. A new attempt with fish highlights a debate over the test’s use and meaning.

Researchers edited macaque embryos to induce symptoms of sleep disorders and chose one animal to clone. A bioethicist questions the study’s appropriateness.

A study of tiny monkey skulls and teeth suggests that shrinking body size didn’t crowd out wisdom teeth during evolution.