San Francisco Marine Biologists Ponder Return of Harbor Porpoise
Harbor porpoises began disappearing from San Francisco Bay during the height of Navy ship activity there during World War II. "We don't know why they disappeared. … It's very possible that they just abandoned the place because it became too hard to feed, reproduce and raise their young," said William Keener, a co-investigator and spokesman with the nonprofit Golden Gate Cetacean Research group. "Then all of a sudden, the porpoises were back."