Monkeys ‘learn to eat soil to cope with junk food’ BBCGibraltar’s monkeys eat mud ‘to avoid upset stomachs from tourist junk food’ The GuardianGibraltar’s monkeys find a clever way to avoid a junk food bellyache ReutersMonkeys have found a bizarre natural supplement to counteract human junk food BBC Science Focus MagazineMonkeys in Gibraltar self-medicate with soil to help them digest tourists’ junk food Phys.org
