The Revenge of the Killer Whales: Attacking Boats in Southern Europe.

Killer whales off the coast of Spain have attacked and sunk boats in apparent acts of revenge, with experts warning that other whales in their pod may copy the behavior. Marine biologists believe that the lead whale, a female orca called White Gladis, became more aggressive after suffering a "critical moment of agony," likely a collision with a boat or entanglement with a fishing line. The behavior has spread among the whales, with a British couple recently sharing their own experience of an orca attack near the coast of Morocco. Scientists have documented orcas exhibiting violent behaviors and appearing to teach them to others.