Birds have always held a special place in the collective imagination of humanity, often seen as something pure, wise, and above reproach. Birds assume a variety of roles in mythology and religion. They play a central part in some creation myths and frequently appear as messengers. They are often associated with the journey of the human soul after death. Birds also appear as tricksters and oracles. Ravens and other species that feed on carrion, the flesh of the dead, may be symbols of war, death, and misfortune, as well as mediators between humans and the supernatural world.