Monkeys in a tourism hotspot have learned that swallowing dirt can quell the upset stomachs caused by overconsumption of sweet and salty snacks fed to them by holidaymakers, a new University of Cambridge-led study suggests. Troops of macaques living on Gibraltar—the only free-ranging monkey popula tion in Europe—have been scientifically observed for the first time regularly engaging in geophagy, the practice of intentionally ingesting soil. The work appears in Scientific Reports. ...read more read less