Birds!

Millions and millions of years ago, a great catastrophe shook the planet. Where there had once been plenty, only a single avian rose from the ashes. It had sparkling feathers, sharp teeth, and great size. A perfect predator. The catastrophe had spared the creature's life, but enviously demanded the predator's carnivory and grand strength in exchange. The predator agreed, and the catastrophe subsided. The creature, now weakened, was undefeated, for its tenacity and spirit were far stronger than any trait the catastrophe stole. Finally unburdened, it took to the skies.