The Raven and the Wolf--A Study in Symbiosis

https://owlcation.com/stem/The-Raven-and-the-Wolf-A-Study-in-Symbiosis

Corvids Will Develop Relationships with Humans

https://www.theepochtimes.com/uplift/little-girl-left-food-out-for-birds-but-after-they-follow-her-to-school-strangest-things-show-up_2406655.html

https://owlcation.com/stem/The-Raven-and-the-Wolf-A-Study-in-Symbiosis


https://hubpages.com/animals/The-Bird-Called-Raven


https://hubpages.com/animals/The-Intelligence-of-the-Raven