A vengeful killer whale thought to have been left traumatised by a collision with a boat has taught other orcas to attack vessels around Gibraltar, scientists say.Researchers believe the female killer whale called White Gladis is taking revenge on boats by coaching orcas, who have already caused two yachts to sink.They think a 'critical moment of agony' – in which White Gladis may have collided with a vessel or was caught in illegal fishing nets – led to her aggression to boats.
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