Pakistani shepherds unload animals at a market set for Muslim festival Eid al-Adha in Islamabad on November 20, 2009. Muslims across the world are preparing to celebrate the annual festival of Eid ul-Adha, or the Festival of Sacrifice, which marks the end of the Hajj pilgrimage to Mecca and in commemoration of Prophet Abraham's readiness to sacrifice his son to show obedience to God.