May I suggest the book "Mind of the Raven" by Bernd Heinrich. Excellently written and extremely interesting. He has spent a life time studying animal behavior in particular Corvidae.

"Bernd Heinrich is a biologist and author of numerous books on the natural world. He lives in Richmond, VT, and in a cabin in the forests of western Maine."

https://www.amazon.com/Mind-Raven-Investigations-Adventures-...