Orcas' Anti-Boat Strategies Evolve: Sailor Reports Increased Speed and Precision in Attacks.

Orcas off the coast of Spain are increasingly touching, pushing, and even turning boats, with some incidents resulting in sinking. Experts believe that the behavior may be taught among the highly intelligent species, and theories suggest that it could be a form of "play" or a result of negative experiences with boats. No human injuries or deaths have been reported, but experts are calling for international coordination to prevent future damage to people, orcas, and vessels.