What's alarming is that younger orcas are learning how to do it:
> Two days earlier, a pod of six orcas assailed another sailboat navigating the strait. Greg Blackburn, who was aboard the vessel, looked on as a mother orca appeared to teach her calf how to charge into the rudder. "It was definitely some form of education, teaching going on,"
> Experts suspect that a female orca they call White Gladis suffered a "critical moment of agony" — a collision with a boat or entrapment during illegal fishing — that flipped a behavioral switch. "That traumatized orca is the one that started this behavior of physical contact with the boat,"
> Two days earlier, a pod of six orcas assailed another sailboat navigating the strait. Greg Blackburn, who was aboard the vessel, looked on as a mother orca appeared to teach her calf how to charge into the rudder. "It was definitely some form of education, teaching going on,"
https://www.livescience.com/animals/orcas/orcas-have-sunk-3-...
> Experts suspect that a female orca they call White Gladis suffered a "critical moment of agony" — a collision with a boat or entrapment during illegal fishing — that flipped a behavioral switch. "That traumatized orca is the one that started this behavior of physical contact with the boat,"