The Greeks associated Ravens with Apollo, the god of prophecy. In the Middle Ages they were known to save and protect saints, the Vikings and Celts associated them with battlefields, Odin using them as his ‘eyes and ears’ or ‘thought and memory’. In Hinduism they are regarded as ancestors and protectors of property and native tribes of the Pacific North West assigned them, ‘Creator of the World’. The cyclical popularity of the stories of Edgar Allan Poe, currently revived, honor Ravens with iconic and artistic relevance. Perhaps it is there sheer size, beauty and intelligence that force humans to notice them and note their strange and articulate language.
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Also, if you’re interested in birdsong check out these books: Why Birds Sing (David Rothenberg) and The Singing Life of Birds (Donald Kroodsma)!