I read as much as I can about corvids. I think it was Heinrich's work in the The Mind of the Raven that talked about "happy" raven calls for friends as opposed to angry calls for foes and experiments showing the bird's memory of human faces as friend or foe even after years apart.
There are also anecdotal accounts of people experiencing rare night calls from crows and ravens that "warn" them of what (to the teller's of the tales) are mystical future happenings.
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