Animals - Sharks actually vs Dolphins actually

Sharks kill to eat it's nothing personal, just the rules of nature.
Dolphins on the other hand will bully smaller fish for their own amusement.

Sharks: I'm gonna sneak attack this seal and critically wound it in order to guarantee a quick kill so that I can eat.

Orcas: Despite being larger and more powerful than any predatory shark, I'm gonna beat this litte seal to death over the course of an hour because it's fun.