This book traces the history of birds right back to their reptilian origins. It underlines their homogeneity - flight, beak, skeleton and feathers are a bird's reference points - without losing sight of their diversity. Morphological and biological diversity (reproduction especially), but also adaptative. How do they withstand the cold and the predators, how do flightless birds run, how do you fly when you are a vulture? This book explores the intimacy of birds whose habits awaken the curiosity - the Grey Cuckoo, certain species of pigeon or the Hamerkop. It also discusses the relationship between humans and birds.