Why cats decided to live with people
5,300 years ago in China, grain attracted rodents, which attracted cats to live alongside the farmers, new research with bones suggests. The study offers the first direct evidence of how cats were domesticated.
Long before it was immortalized in a British nursery rhyme, the cat that caught the rat that ate the malt was doing just fine living alongside farmers in the ancient Chinese village of Quanhucun.
“At least three different lines of scientific inquiry allow us to tell a story about cat domestication that is reminiscent of the old ‘house that Jack built’ nursery rhyme,” says study co-author Fiona Marshall, a professor of archaeology at Washington University in St. Louis.
“Our data suggest that cats were attracted to ancient farming villages by small animals, such as rodents that were living on the grain that the farmers grew, ate, and stored.”
“Results of this study show that the village of Quanhucun was a source of food for the cats 5,300 years ago, and the relationship between humans and cats was commensal, or advantageous for the cats,” Marshall says.
“Even if these cats were not yet domesticated, our evidence confirms that they lived in close proximity to farmers, and that the relationship had mutual benefits.”
Cat remains rarely are found in ancient archaeological sites, and little is known about how they were domesticated. Cats were thought to have first been domesticated in ancient Egypt, where they were kept some 4,000 years ago, but more recent research suggests close relations with humans may have occurred much earlier, including the discovery of a wild cat buried with a human nearly 10,000 years ago in Cyprus.
While it often has been argued that cats were attracted to rodents and other food in early farming villages and domesticated themselves, there has been little evidence for this theory.
The evidence for this study, published in PNAS, is derived from research in China led by Yaowu Hu and colleagues at the Chinese Academy of Sciences. Hu and his team analyzed eight bones from at least two cats excavated from the site.
Using radiocarbon dating and isotopic analyses of carbon and nitrogen traces in the bones of cats, dogs, deer, and other wildlife unearthed near Quanhucan, they demonstrated how a breed of once-wild cats carved a niche for themselves in a society that thrived on the widespread cultivation of the grain millet.
Carbon isotopes indicate that rodents, domestic dogs, and pigs from the ancient village were eating millet, but deer were not. Carbon and nitrogen isotopes show that cats were preying on animals that lived on farmed millet, probably rodents.
At the same time, an ancient rodent burrow into a storage pit and the rodent-proof design of grain storage pots indicate that farmers had problems with rodents in the grain stores.
Other clues gleaned from the Quanhucun food web suggest the relationship between cats and humans had begun to grow closer. One of the cats was aged, showing that it survived well in the village. Another ate fewer animals and more millet than expected, suggesting that it scavenged human food or was fed.
Recent DNA studies suggest that most of the estimated 600 million domestic cats now living around the globe are descendants most directly of the Near Eastern Wildcat, one of the five Felis sylvestris lybica wildcat subspecies still found around the Old World.
Marshall, an expert on animal domestication, says there currently is no DNA evidence to show whether the cats found at Quanhucun are descendants of the Near Eastern Wildcat, a subspecies not native to the area.
If the Quanhucun cats turn out to be close descendants of the Near Eastern strain, it would suggest they were domesticated elsewhere and later introduced to the region.
“We do not yet know whether these cats came to China from the Near East, whether they interbred with Chinese wild-cat species, or even whether cats from China played a previously unsuspected role in domestication,” Marshall says.
Researchers based in China and in France are now pursing that question.
Other members of the research team include Xianglong Chen, Changsui Wang, and Liangliang Hou, all affiliated with the Chinese Academy of Sciences’ Key Laboratory of Vertebrate Evolution and Human Origins and the Institute of Vertebrate Paleontology and Paleoanthropology; Songmei Hu, of the Archaeological Research Institute of Shaanxi Province, Xi’an, China; and Xiaohong Wu, of the Department of Archaeology, Peking University, in Beijing.
Changsui Wang designed the research project. Songmei Hu, a zooarchaeologist, conducted the biometric measurement of cat bones. Weilin Wang, an archaeologist, excavated the Quanhucun site and supplied the archaeological context, including pottery cited in the paper. Xianglong Chen and Liangliang Hou prepared collagen samples for testing, and Xiaohong Wu conducted the radiocarbon dating.
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