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Shepherds walk with their flock along the Medjreda river on October 15, 2016 in the small town of Testour, located in the north of Tunisia in the Beja province. / AFP / FETHI BELAID (Photo credit should read FETHI BELAID/AFP/Getty Images)

Shepherds walk with their flock along the Medjreda river on October 15, 2016 in the small town of Testour, located in the north of Tunisia in the Beja province. / AFP / FETHI BELAID        (Photo credit should read FETHI BELAID/AFP/Getty Images)