Soil helps monkeys' stomachs settle after calorie-rich snacks from tourists, research suggests.
Monkeys 'learn to eat soil to cope with junk food'
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Wed 09:00 - El Mundo (ES)
Gibraltar monkeys eat dirt and tar to digest human junk food
Wed 12:27 - BBC Headlines
Monkeys 'learn to eat soil to cope with junk food'
Wed 12:44 - Sky News (UK)
The tactic monkeys have adopted to settle stomachs after eating junk food