Great post! Last year shark diving charters in Cape Town, noticed that they where not seeing great white sharks when taking tourists out for cage diving.
They came across some shark carcasses with the livers removed and later found out that a group of Orcas where hunting around the Cape coast, South Africa.
South Africa is the closest thing to the South Pole which is the original habitat of the killer whales. They've also discovered some Elephant Seals on nearby islands (very close to the Cape), which is not a natural habitat for these creatures. No one is sure why these animals are so far from their home. Theory is global warming.
This was an article last year: https://www.iol.co.za/capetimes/news/look-orcas-in-cape-waters-killing-white-sharks-8999601