Conversation so far:
Tell me about Orca whales.
Orcas, or killer whales, are the largest of the dolphins and one of the world's most powerful predators. They're immediately recognizable by their distinctive black-and-white coloring.
Are Orca whales really whales?
They are often confused for being a whale because of their name 'killer whale', but did you know that orcas are actually dolphins? In fact, they are the largest member of the dolphin family!

Question: How do they hunt?
Self-contained rewrite: How do Orca whales hunt?