The 43 rhesus macaque monkeys that escaped a South Carolina medical lab this week are among the most studied animals on the planet. And for more than a century, they have held a mirror to humanity, ...

A group of scientists restored vision in a monkey by using human stem cells to fix a hole in its retina. The research could open new doors for vision treatment in humans and other animals, too. A new ...

Deep in the rainforest, the monkeys are yodeling. Their wild calls echo across the foliage, sending signals of sex and survival. For decades, scientists have studied why they make these sounds, but ...