The Evolution of Brains and Behavior

Episode 19 of What Darwin Didn't Know

In Darwin's lifetime, comparisons between the brains of different species were restricted to examinations of anatomy alone. Today, researchers use genetic tools to gain deep insights into how behaviors and sensory abilities evolve. Study behavior in creatures from fire ants to crows to humans, asking how did human brains get so large - and why are big brains so useful anyway?