The complex behavior of birds recounted here demonstrates that birds have sophisticated mental abilities previously unrecognized by conventional avian research. Ackerman supports her thesis with descriptions of the behavior of an entertaining variety of birds from across the world. She brings scientific research alive with personal field observations and accounts of her encounters with colorful and fascinating birds. Throughout, Ackerman reminds readers that birds are thinking beings--their brains are wired differently than those of mammals, giving them increased brain power despite their small size. She further makes the case that bird intelligence shows that humankind is not alone in using language and tools or constructing complex structures and manipulating other creatures.