What is the biggest whale ever? How do right whales size up? North Atlantic Right whales (Eubalaena glacialis) are big, but they're not the biggest whales. That distinction goes to the Blue whale (Balaenoptera musculus), the largest whale on Earth. While the Orca, or Killer whale size of up to 31 feet make it the largest dolphin. The Sperm whale on the other hand may not be the biggest whale, but it has the biggest brain to have ever existed on Earth.
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