Cooked heads of sheep are placed on a wooden board at a market in Doha on the eve of Eid al-Adha festival at the sheep market in Doha December 7, 2008. Muslims across the world are preparing to celebrate the annual festival of Eid al-Adha or the Festival of Sacrifice, which marks the end of the haj pilgrimage to Mecca by millions of Muslims around the world. The slaughtering of livestock commemorates Prophet Abraham's readiness to sacrifice his son to show obedience to Allah. REUTERS/Fadi Al-Assaad (QATAR)