In 1888, a Risso’s dolphin appeared in the sounds. This dolphin became famous as Pelorus Jack and became the first dolphin in the world to receive the protection of the law. Pelorus Jack would accompany boats to and from the notorious French Pass. He would join boats bound for Nelson at the entrance to Pelorus Sound and for eight kilometres would ride their bow waves to Pelorus Sound. He did not go through the pass with them, but would met returning boats as they exited the pass. Pelorus Jack was last seen in April 1912. The lightkeeper at French Pass claimed he found the body of Pelorus Jack decomposing on the shore.