Many references to ravens exist in world lore and literature. Most depictions allude to the appearance and behavior of the wide-ranging common raven. Because of its black plumage, croaking call, and diet of carrion, the raven is often associated with loss and ill omen. Yet, its symbolism is complex. As a talking bird, the raven also represents prophecy and insight. Ravens in stories often act as psychopomps, connecting the material world with the world of spirits.

The common raven is a large all-black passerine bird. It is the most widely distributed of all corvids, found across the Northern Hemisphere. It is a raven known by many names at the subspecies level; there are at least eight subspecies with little variation in appearance, although recent research has demonstrated significant genetic differences among populations from various regions. It is one of the two largest corvids, alongside the thick-billed raven, and is possibly the heaviest passerine bird; at maturity, the common raven averages 63 centimetres in length and 1.47 kilograms in mass. Although their typical lifespan is considerably shorter, common ravens can live more than 23 years in the wild. Young birds may travel in flocks but later mate for life, with each mated pair defending a territory.