單元

1. "To Fly or Not to Fly?" 2. "The Mastery of Flight" 3. "The Insatiable Appetite" 4. "Meat-Eaters" 5. "Fishing for a Living" 6. "Signals and Songs" 7. "Finding Partners" 8. "The Demands of the Egg" 9. "The Problems of Parenthood" 10. "The Limits of Endurance"

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