* Deep Thinkers: Inside the Minds of Whales, Dolphins, and Porpoises by Janet Mann

* The Cultural Lives of Whales and Dolphins by Hal Whitehead and Luke Rendell

Whales in general are very fascinating in their social and emotional intelligences. Orcas just take their raw intelligence to a new level.

Also, I am not aware of that work. So thank you! I have been meaning to read Against the Grain by James C. Scott. He mentions that early agrian societies had less leisure time and were less healthy than their hunter gatherer counterparts.