On the next day my wife’s fever was renewed, but she was placed on a dromedary and we reached Cassala about sunset. The place is rich in hyenas, and the night was passed in the discordant howling of these disgusting but useful animals. They are the scavengers of the country, devouring every species of filth and clearing all carrion from the earth. Without the hyenas and vultures the neighborhood of a Nubian village would be unbearable. It is the idle custom of the people to leave unburied all animals that die; thus, among the numerous flocks and herds, the casualties would create a pestilence were it not for the birds and beasts of prey.