There was once a Risso's dolphin named Pelorus Jack that was famous for meeting and escorting ships through a stretch of water in Cook Strait, New Zealand, between 1888 and 1912. It was usually spotted in Admiralty Bay between Cape Francis and Collinet Point, near French Pass, a notoriously dangerous channel used by ships travelling between Wellington and Nelson. The dolphin would guide the ships by swimming alongside a water craft for 20 minutes at a time. If the crew could not see Jack at first, they would often wait for him to appear. It was approximately 13 feet long and was of a white color with grey lines or shadings, and a round, white head. Although its sex was never determined, it was identified from photographs as a Risso's dolphin, Grampus griseus. This is an uncommon species in New Zealand waters, and only 12 Risso's dolphins have been reported in that area.