Rhesus macaques on Cayo Santiago are known for being intolerant, hierarchical and aggressive. After 2017's Hurricane Maria destroyed their home, the monkeys' society underwent surprising changes.

Casey Affleck is throwing his weight behind a pending bill in the Massachusetts legislature that would prevent infant primates from being removed from their mothers for research, experimentation and ...

The animal rights group is suing the National Institute of Mental Health, saying it has a right to hear and see rhesus macaque monkeys used in experiments.

Between the Old World, which includes Africa and Asia, and the New World, which includes Mexico and Central and South America ...

Nearly 1,400 rhesus macaques were brought to the Florida Keys by a laboratory animal breeding company in the 1970s but they were ordered removed in 1997 after they destroyed 30 acres of mangroves.

MILWAUKEE — An addition to the Milwaukee County Zoo's macaque family arrived when Usagi, a 12-year-old Japanese macaque, welcomed her second baby on June 8, increasing the troop's size to 11 ...

Rhesus macaques A photo of a mama with baby, Rhesus Macaques monkeys at Silver Spring State Park, Ocala. Camera used was a Canon R5 with a Sigma 150-500 lens.

FILE - A rhesus macaque monkey rests his chin on a water pipe on Cayo Santiago, known as Monkey Island off the eastern coast of Puerto Rico, Tuesday, July 29, 2008. (AP Photo/Brennan Linsley, Fiel) ...

In 2007, scientists unraveled the DNA of the rhesus macaque. The species shared about 93% of its DNA with humans, even though macaques branched off from the ape family about 25 million years ago.