Things you know :)

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Across
  1. 3. Nocturnal bird of prey
  2. 8. Device for capturing images
  3. 9. Dense cluster of trees
  4. 11. Bright, yellow, follows the sun
  5. 12. Predatory fish with sharp teeth
  6. 14. Carries its home on its back
  7. 15. Organs for sight
  8. 17. Intelligent marine mammal
  9. 18. Tall, long-necked herbivore
  10. 19. Insect known for its chirping sound
Down
  1. 1. Facial expression showing happiness
  2. 2. Fastest land animal
  3. 4. Majestic wild cat
  4. 5. Colorful insect with delicate wings
  5. 6. Enormous marine mammal
  6. 7. Colorful talking bird
  7. 10. Slithers without legs
  8. 13. Flightless bird, great swimmer
  9. 16. Eight-legged web-weaver