Fun fact: Orcas are absolute dicks. They are one of a very small list of animals that will kill for fun and not food. They are the top of the list and most heavily documented exhibiting this behavior.

Probably an attempt at juxtaposition, as rich people are frequently referred to as sharks.

IIRC it is a big deal because the orcas have taken to driving out the native South African population of great whites, which isn't normal. (insert clever apartheid joke here)