21

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Across
  1. 1. - Intelligent marine mammal (7 letters)
  2. 3. - Large reptile (9 letters)
  3. 5. - Yellow fruit (6 letters)
  4. 6. - Smooth stone (6 letters)
  5. 8. - Large black bird (5 letters)
  6. 10. - Western rider (6 letters)
  7. 13. - Large mammal with tusks (8 letters)
  8. 15. - Red, juicy fruit (10 letters)
  9. 17. - Elastic material (6 letters)
  10. 19. - Flightless bird (7 letters)
  11. 20. - Rain protection (8 letters)
Down
  1. 2. - Small, nectar-feeding bird (11 letters)
  2. 4. - Larval stage of a butterfly (11 letters)
  3. 7. - Dog breed (6 letters)
  4. 9. - Computer peripheral (5 letters)
  5. 11. - Flying machine (8 letters)
  6. 12. - Starchy tuber (6 letters)
  7. 14. - Nut in a hard shell (6 letters)
  8. 16. - Citrus fruit (6 letters)
  9. 18. - Tall African mammal (7 letters)