The Mysterious Rise of Killer Whale Attacks on Boats.

Killer whales off the coast of Spain and Portugal have been ramming into boats, causing damage and raising questions about their behavior. The incidents have more than tripled in the past two years, and the reason for the behavior remains a mystery. While some speculate the whales may be retaliating or teaching each other, experts believe it may just be playful behavior that's gotten out of hand. The behavior is dangerous and could result in a boater being killed, but there are no reports of the whales attacking humans.