EL PAIS
Gibraltar’s monkeys eat dirt to purge the junk food tourists give them
By Miguel Ángel Criado
Macaques ingest clumps of clay to help their digestive system process the sugars, fats, and dairy products from human snacks
By Miguel Ángel Criado
Macaques ingest clumps of clay to help their digestive system process the sugars, fats, and dairy products from human snacks