What's fascinating is that there are transient and resident orcas that live in close proximity to each other but are completely different in diet and social structure.
The transient orcas eat mammals whereas the residents eat fish.
They do know interact with each other at all when frequenting the same spots, genetic evidence reveals they have not shared a common ancestor for at leat 750,000 years.
Amazing creatures and certainly the most powerful hunter on the planet, after us of course.