The British territory’s Barbary macaques are the only wild monkeys in Europe. But many are consuming human snacks high in calories, sugar, salt and dairy, and low in fiber The monkeys sometimes steal food from tourists. Martin Nicourt / Gibraltar Macaques Project Move over, Tums. Monkeys in Gibraltar seem to have found an unusual health hack to deal with upset stomachs. The British territory’s famous macaques have learned to eat dirt to help with digestion issues caused by eating snacks given by—or stolen from—tourists, researchers report in a study published March 19 in the journal  Scientific Reports . The work “sheds light on the adaptability of these primate populations living in highly anthropogenic landscapes,” says study co-author  Sylvain Lemoine , a primate behavioral ecologist at the University of Cambridge in England, to Ed Cara at  Gizmodo . About 230 Barbary macaques live on Gibraltar, located at the southern tip of the Iberian Peninsula, bordering Spain.…