Livestock merchants unload their animals as they wait for buyers, a day ahead of the Muslim holiday of Eid al-Adha, at a market in Sudan's capital Khartoum on July 19, 2021. - Known as the "big" festival, Eid Al-Adha is celebrated each year by Muslims sacrificing various animals according to religious traditions, including cows, camels, goats and sheep. (Photo by ASHRAF SHAZLY / AFP)