A sheep is seen at a market on the outskirts of Algiers, ahead of the Eid-al-Adha festival, November,15 2010. 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 hundreds of millions of Muslims, with the slaughter of goats, sheep and cattle in commemoration of the Prophet Abraham's readiness to sacrifice his son to show obedience to Allah.