These rare killer whales are threatened by shipping noise. AI is turning down the din | CNN

In photos: Southern resident killer whales of the Pacific 5 photos A southern resident killer whale leaps above the water. One of the only types of orca that primarily hunts fish, the endangered population numbers just 76, and was only discovered to be a distinct group in the 1970s. Look through the gallery to see more. In photos: Southern resident killer whales of the Pacific A southern resident killer whale leaps above the water. One of the only types of orca that primarily hunts fish, the endangered population numbers just 76, and was only discovered to be a distinct group in the 1970s.