The harbor porpoise that washed ashore last month at San Francisco's Fort Funston was clearly a victim of foul play. It had two badly broken jawbones, fractured ribs on both sides and a broken scapula, evidence of a sadistic attack. Worst of all, the female porpoise, which had been seen twice before and identified by researchers in Monterey Bay, was lactating when she was killed, according to marine biologists. It was a clear case of what scientists are calling "porpicide," the deliberate slaying of a harbor porpoise by a surprising and, to most people, unlikely culprit. "We suspect that it...