Macaques use stones as hammers to smash open food items like shellfish and nuts. Lydia V. Luncz hide caption
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A macaque monkey in a tree in Fukushima prefecture. After the 2011 nuclear disaster, towns and neighborhoods in Fukushima were left devoid of humans for years, and nature started to reclaim the space. Claire Harbage/NPR hide caption
In Rural Fukushima, 'The Border Between Monkeys And Humans Has Blurred'
A rhesus macaque monkey grooms another on Cayo Santiago, off the eastern coast of Puerto Rico. Brennan Linsley/AP hide caption
An MRI scan of a person listening to music shows brain areas that respond. (This scan wasn't part of the research comparing humans and monkeys.) KUL BHATIA/Kul Bhatia/Science Source hide caption
A Musical Brain May Help Us Understand Language And Appreciate Tchaikovsky
How do we make sense of all that chatter? Ilana Kohn/Getty Images hide caption
How People Learned To Recognize Monkey Calls Reveals How We All Make Sense Of Sound
Zhong Zhong (left) and Hua Hua are the first primate clones made by somatic cell nuclear transfer, the same process that created Dolly the sheep in 1996. Qiang Sun and Mu-ming Poo/Chinese Academy of Sciences/Cell Press hide caption
Chinese Scientists Clone Monkeys Using Method That Created Dolly The Sheep
Monkey at Batu Caves in Malaysia. Jean-François Chénier/Flickr hide caption
Washu chocolate is made from cacao arriba, a sought-after variety of cacao harvested in Ecuador. Ryan Eskalis/NPR hide caption
Pig-tailed macaques like these, seen in a German zoo, raided a voting place in Thailand on Sunday. Patrik Stollarz/AFP/Getty Images hide caption
The culprit is believed to be a vervet monkey (though not this particular one, photographed in 2012 in Kenya's Maasai Mara). Ben Curtis/AP hide caption
Maya, shown with her newborn, Kip, had to use her wits to rise above her lowly station in the social hierarchy of her group of macaque monkeys. Jeff Wilson/Disney hide caption
Mother and infant Bouvier's red colobus monkeys in a first-ever photograph of the primate taken in the Democratic Republic of Congo. The species was thought to have gone extinct in the 1970s. Lieven Devreese and Gaël Elie Gnondo Gobolo/Ntokou-Pikounda National Park, DRC hide caption
The Trained Pig Show, circa 1898 Library of Congress hide caption
The long-tailed macaque carries a virulent strain of malaria that is responsible for an increasing number of human infections in Malaysia. Shankar S./Flickr hide caption
Researchers download images after a drone flight in Sabah, Malaysia. Courtesy of Trends in Parasitology, Fornace et al hide caption
This 2011 image taken by a crested black macaque in Indonesia has ignited a debate over who owns the photo. The camera's owner says the image belongs to him. In its new manual, the U.S. Copyright Office disagrees. David J Slater/Caters News Agency/Wikimedia Commons hide caption
Two white-headed capuchin monkeys (also known as the white-faced capuchin or white-throated capuchin) on Gorgona island, off Colombia's Pacific coast. AFP/Getty Images hide caption
The monkey Iranian authorities said was sent to space in January. AFP/Getty Images hide caption
Just give me* some time and I'll get you some copy! (*For the record, this is not actually a monkey; it's a chimpanzee. It's the best we could do, under the circumstances.) Lise Gagne/iStockphoto hide caption
A monkey invades the field during a cricket match in Ahmedabad, India, in 2012. Gareth Copley/Getty Images hide caption
Aotus lemurinus, a type of owl monkey also referred to as the gray-bellied night monkey, seen here at the Santa Fe Zoo, in Medellin, Colombia. Raul Arboleda/AFP/Getty Images hide caption