Sheep, to be slaughtered during next week's Eid al-Adha holiday, are displayed for sale at a market in Riyadh October 11, 2013. Muslims around the world are preparing to celebrate Eid al-Adha (feast of sacrifice), marking the end of the Haj, by slaughtering sheep, goats, cows and camels to commemorate Prophet Abraham's willingness to sacrifice his son Ismail on God's command. REUTERS/Faisal Al Nasser (SAUDI ARABIA - Tags: RELIGION ANIMALS SOCIETY)