*Les Dauphins* is an illustrated natural-history volume about dolphins, presenting their biology, behavior, habitats, and relationship with humans for general readers. Associated with National Geographic and authored by T. Cahill, the work appears to combine accessible science writing with photography, explanatory captions, and contextual material on marine mammals. Its 216-page format suggests a substantial picture-led book rather than a brief pamphlet, offering an introduction to dolphin communication, social structure, feeding, movement through ocean environments, and conservation concerns. The title belongs in wildlife, ocean-life, and photographic nonfiction collections.