The greedy dragon

Once upon a time, long ago before human existence there lived a wing of dragons and a flock of dinosaurs. Dinosaurs were dragons' predators. Dinosaurs were hungry and generous. Dragons were harmless and simple. In the dragons' dynasty there was a young dragon named Burna. One day, Burna was flying. She saw the dinosaurs with a chest of golden jewels, and got very greedy. She told this to the other dragons and planned to attack the dinosaurs, but the other dragons didn't agree. Then Burna betrayed her own friends. She told them that the dinosaurs were planning to attack the dragons. They believed her the dragons created an asteroid and threw it on earth destroying dragons and dinosaurs.