The skull changed shape in different ways than the brain during evolution, according to a new comparative study.

Bonobos eat their aquatic greens, perhaps to get their daily dose of iodine.

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

For primates, males’ fancier ornaments are linked with smaller testes, according to a new comparative study.

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.

The function of early hominins’ enlarged brow ridges, and their reduction in size in Homo sapiens, have puzzled paleoanthropologists for decades.

A study finds two species of guenon monkeys in Tanzania have been mating and producing fertile offspring for generations.

The approach, which has never before been successfully attempted in primates, could lead to improved animal models for human biology and disease.

The Tapanuli orangutan has been identified as the newest species of great ape, but also likely the most endangered.