Jonathan Livingston Seagull

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Across
  1. 5. a thing that blocks one's way or prevents or hinders progress
  2. 6. physically strong, fit, and active
  3. 10. having a shape which reduces the drag from air moving past
  4. 11. pleasant or attractive
  5. 12. holding or catching the attention
  6. 13. active at night
  7. 15. showing or involving great activity or vitality
  8. 16. flying or rising high in the air
Down
  1. 1. the force that gives something its vitality or strength
  2. 2. stunts performed in flight by an airplane
  3. 3. impossible to stop or prevent
  4. 4. quick to notice or perceive things
  5. 7. difficult to believe
  6. 8. Opposite of horizontal
  7. 9. free from social conventions or traditional ideas
  8. 14. having or showing great effort or energy