Gibraltar’s monkeys may be eating soil to cope with junk food from tourists

On the Rock of Gibraltar, scientists have observed Barbary macaques engaging in a behavior known as geophagy, which is the intentional consumption of soil and clay. This behavior appears to be a self-medicating response to the upset stomachs caused by the fatty and salty snacks that tourists often feed them. The macaques, which are the only free-ranging monkey population in Europe, have been documented eating soil more frequently, particularly during the holiday season when tourist interactions peak (Scientific American, Phys.org, The Guardian Environment). Researchers from the University of Cambridge conducted a study that found a correlation between the amount of contact the monkeys had with tourists and their soil consumption. Monkeys that interacted more with visitors were observed to eat more soil, suggesting that this behavior may be a learned response to alleviate gastrointestinal discomfort from the junk food they consume (Phys.org, The Guardian Environment). The study highlights how these macaques have adapted to their environment, utilizing geophagy as a means to cope with the negative effects of human-provided food. This behavior has been scientifically documented for the first time, providing insight into the dietary adaptations of these animals in a tourism hotspot (Scientific Reports, Phys.org). The findings underscore the impact of human activity on wildlife and the innovative ways animals can respond to dietary challenges.