Kid's Planet:
The killer whales are in social hierarchies and their pods are lead by the females. They are thought of a complex form of communication wich means that from a different languages of a pod to another.

Marinebio:
The killer whales have a bad reputation so their called the "Ballena Asesina" which means assassin whale. The sailors who witnnessed the attacks on larger cetaceans so they referred them as "whale killers so they got the name of "killer whales". The harm lots of animals in the water even other whales but also harm so these whale hunt in pack so people title them as "Wolves of the sea.

CMS:
The killer whales travel in packs so they hunt for food and their feirceful animals. People think that thier nice but their not they harm humans and other whales so they got the name "killer whales".