Scientists call this phenomenon emotional mimicry. Biologists and psychologists consider this automatic matching of another’s ...

Images of him being bullied by his enclosure-mates, retreating to safety and clinging to a plushie look-alike for comfort won hearts around the world. But finally, Punch the monkey is fitting in.

Fossils show that howler monkey ancestors were eating leaves 13 million years ago, shaping body size and evolution.

From tool-using chimpanzees to puzzle-solving capuchins, the primate world is packed with surprising brainpower. But how do the planet’s cleverest monkeys and apes really compare with human intelligen ...