In the late 1970s, while working at Marineland in California, Alexandra pioneered the recording of orca sounds by dropping a hydrophone into the tank of two killer whales. She recorded the varied language of mating, childbirth, and even grief after the birth of a stillborn calf. At the same time she made the startling observation that the whales were inventing wonderful synchronized movements, a behavior that was soon recognized as a defining characteristic of orca society. In 1984, Alexandra moved to a remote bay in British Columbia to continue her research with wild orcas. Her recordings of the whales have led her to a deeper understanding of the mystery of whale echolocation, the vocal communication that enables the mammals to find their way in the dark sea. A fascinating study of the profound communion between humans and whales, this book will open your eyes anew to the wonders of the natural world.