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Why is an Orca Not a Whale? - Ocean Conservancy
Orca - Wikipedia
Why are orca called killer whales? | HowStuffWorks
Is an Orca a Whale or a Dolphin? (Explained) - Wildlife Informer
Orcas (Killer whales) - National Geographic
Facts about orcas (killer whales) - Whale & Dolphin Conservation …
Are Orcas And Killer Whales The Same? - MarinePatch
Orcas: Facts about killer whales | Live Science
Facts about orcas (killer whales) | Whale and Dolphin …
Killer Whale | NOAA Fisheries