Could be the same pod:
“They’re simply teens goofing around.
“The sea is a very boring place for an animal,” researcher Renaud de Stephanis, president of Spain’s Conservación, Información y Estudio sobre Cetáceos, told USA Today.”
[snip]
And since the young regional marine mammals “have time on their hands,” they’ve turned the act of jutting rudder pieces loose into an aquatic sport, said expert Alexandre Zerbini.
“We think the orcas are getting something out of it, they are enjoying what’s happening. They’re playing,” he said.
Orcas flip ice floes to get walrus and seal meals.
Boat flipping will get some boney creatures that can’t swim well.
Watch as Killer Whales Attack Dutch Yacht in ‘Scary’ Race Incident..
https://freerepublic.com/focus/f-chat/4162970/posts
Teens with too much time on their hands; sounds like Chicago.
Yes its not sinister they are playing. Orcas play rough. Its learned behavior that they are passing on..
A ‘’bang stick’’, a long metal pole fixed with a shotgun shell and a primer pin loaded with double O buck or slugs would fix the problem.
Orcas are like goats in that they enjoy headbutting for a variety of reasons. And they like and need lots of practice (look it up).
When orcas do engage in headbutting, it typically serves specific purposes such as hunting, social interaction, or establishing dominance. Young orcas practice headbutting to prepare them for adult life (just like baby goats).
Fiberglass sailboats make perfect targets for headbutting practice. And if those nice, not-too-hard, not-too-soft sailboats try to sail away, the orcas simply destroy the rudders.
And like most sea mammals, orcas love to chat with their friends about their new hobbies.