It is easy to think of fish as simple, instinct-driven animals. With their tiny brains and seemingly mindless way of drifting through the water, there appears to be nothing going on inside their heads.

“Smart as a Fish” upends this common misperception, revealing how these creatures possess a rich set of cognitive skills finely tuned to the demands of aquatic life, and how the origins of human intelligence may reach further into the evolutionary past than we realize.