April 22 (Reuters) - On the tourist-packed Rock of Gibraltar, one of the most common sights is monkeys begging for food - and sometimes stealing sweet and salty snacks from unsuspecting visitors.

Monkeys living on Gibraltar have learned to swallow soil to settle their stomachs after eating sweet and salty snacks offered or stolen from tourists, according to a Cambridge University study.

Credit: Martin Nicourt/Gibraltar macaques project. Monkeys living on Gibraltar have learned that swallowing soil can quell upset stomachs caused by eating sweet and salty snacks offered by or stolen ...

Monkeys living on Gibraltar have learned that swallowing soil can quell upset stomachs caused by eating sweet and salty snacks offered or stolen from holidaymakers, research suggests. Snacks such as ...