Having a bird brain was once an insult. But not anymore. Despite their small size, birds whack an intellectual punch. Birds can solve puzzles. They play. They can shape and use tools. They communicate and they teach. Birds exhibit complex behaviour requiring sophisticated mental ability.  
In her book Jennifer Ackerman recounts personal field observations made all over the world and combines this with the latest findings in bird anatomy and neuroscience.  
Listen to Robyn Williams speaking with Jennifer Ackerman here.