Why have orcas started ramming boats?

摘要

MARTIN EVANS, a sailor on his way to Greece, was about 80 kilometres from Gibraltar on 17 June when he saw the orcas. "I knew immediately that we were having a major issue," he says. "I jumped onto the helm and tried to hand steer the boat, but it was ripped from my hands with tremendous force." For 2 hours, about a dozen orcas, also known as killer whales, circled the boat, bashing repeatedly against the bottom. "At one point, I looked astern and saw bits of the rudder that were broken off floating away," he says.