In northern Northwest Coast mythology, Raven is the powerful figure who transforms the world. Stories tell how Raven created the land, released the people from a cockle shell, and brought them fire. Raven stole the light and brought it out to light up the world. Yet Raven is a trickster—often selfish, hungry, and mischievous. He changes the world only by cleverly deceiving others in his never-ending quest for food.
In Northwest Coast art, ravens signify the many adventures of Raven in the early days of the world. Those who know the stories cannot help being reminded of the trickster whenever they see a raven.
What im saying is that the raven can be cruel and take things and help itself
OR it canbe helpful and get rid of bad things and do good (like cleaning up a dead carcass, scaring things away for are saftey...)