Why Corpses Rot

Before humans rotted, every dead body was carried to the underworld by winged monkeys, who threw them into a large pit that surrounded The God Of Fear And Hunger. She loved her corpses, but eventually the pit became so full of carrion that the corpses would fall out, and it became pointless for her to collect any more. She decided instead to leave the corpses on the ground and allow moss to grow on them. Eventually bugs came out from the endless void and began feeding on the flesh of dead people. Ravens and other birds as well as animals all began developing a taste for meat, so they started eating it before it went bad.