From Susan Casey, theNew York Timesbestsellingauthor ofThe Devil's TeethandThe Wave,a breathtaking look into the mysterious world of dolphins and their conflicted history with man.Since the dawn of recorded history, humans have felt a kinship with the sleek and beautiful dolphin, an animal whose playfulness, sociability and intelligence seems like an aquatic mirror of mankind. In recent decades, scientists have discovered dolphins recognize themselves in reflections, count, feel despondent, adorn themselves, rescue each other (and humans), deduce, infer, form cliques, throw tantrums, gossip and scheme.Several native peoples trace their lineage to dolphins. They are the stars of multi-million dollar aquatic theme parks, money which has fueled a sinister illicit trade as shown in the documentaryBlackfish. The U.S. Navy has a secret program using dolphins as undersea soldiers. The theory that they are a superior,...