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Zooarchaeologist Ophélie Lebrasseur and her team examined a fox skeleton discovered in 1991 at an archaeological site alongside artifacts of human habitation (like spear points) in central Argentina. Lebrasseur et al. determined that the fox was Dusicyon avus, an extinct species resembling a jackal, and radiocarbon dating placed the fox at the site at the same time as human inhabitants. (Indeed, the inhabitants may have deliberately buried the fox.) In addition, while wild foxes have a diet entirely made of meat, isotopic signatures of the skeleton's teeth indicated that the fox's diet, like that of the humans, was partly composed of plant material. Lebrasseur et al. therefore concluded that