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  1. Flipper (anatomy) - Wikipedia

  2. All About Penguins - Physical Characteristics | United Parks

  3. Do Penguins Have Wings or Flippers? - Penguins Blog

  4. 10 Penguin Adaptations (Evolutionary Secrets!) - Fauna Facts

  5. Penguin - Flightless, Adaptations, Aquatic | Britannica

  6. Penguin - Wikipedia

  7. Penguin Fact Sheet | Blog | Nature - PBS

  8. 15 Amazing Emperor Penguin Adaptations (Pictures)

  9. Exploring the Structure and Functionality of Flippers

  10. What is the function of a penguin's flippers? - CK-12 Foundation