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Orca - Wikipedia
Is an Orca a Whale or a Dolphin? (Explained) - Wildlife Informer
Killer whale | Definition & Facts | Britannica
Orcas (Killer whales) - National Geographic
Why is an Orca Not a Whale? - Ocean Conservancy
Orca vs Dolphin: What's the Difference? - American Oceans
Are Orcas Not Whales But Dolphins? | Snopes.com
Facts about orcas (killer whales) - Whale & Dolphin Conservation …
Orcas - National Geographic Society
Killer Whale | NOAA Fisheries