The best popular book on animal intelligence is Second Nature: The Inner Lives of Animals by Jonathan Balcombe. This Sunday’s New York Times has an excellent piece by Balcombe about the intelligence of fish:
“As a biologist who specializes in animal behavior and emotions, I’ve spent the past four years exploring the science on the inner lives of fishes. What I’ve uncovered indicates that we grossly underestimate these fabulously diverse marine vertebrates. The accumulating evidence leads to an inescapable conclusion: Fishes think and feel.”
peakmemory 
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