National Geographic : 1940 Jan
WHALES, GIANTS OF THE SEA Photograph by Frank Salisbury LEAPING HIGH OUT OF WATER, DOLPHINS ESCORT AN AUSTRALIAN VESSEL In similar fashion, a dolphin known as "Pelorus Jack" swam ahead of ships entering and leaving Pelorus Sound, New Zealand, for about 32 years (page 85). These animals are Dusky Dolphins (Lagenorhynchus obscurus) and were photographed from a ship between Sydney and Brisbane. They frequently are seen along the coasts of Australia and New Zealand. Among the smaller cetaceans, those with beaks are called dolphins, and those without are porpoises.