16

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Across
  1. 4. - Sandy shore (5 letters)
  2. 6. - Dwarf planet (5 letters)
  3. 7. - Celestial path (5 letters)
  4. 11. - Small, nectar-feeding bird (11 letters)
  5. 12. - Tropical fruit (5 letters)
  6. 13. - Large black bird (5 letters)
  7. 15. - Tall African mammal (7 letters)
  8. 16. - Large reptile (9 letters)
  9. 19. - Large mammal with tusks (8 letters)
Down
  1. 1. - Citrus fruit (5 letters)
  2. 2. - Condensed water vapor (5 letters)
  3. 3. - Flying machine (8 letters)
  4. 5. - Drinking tube (5 letters)
  5. 6. - Flightless bird (7 letters)
  6. 8. - Computer peripheral (5 letters)
  7. 9. - Rabbit, informally (5 letters)
  8. 10. - Rain protection (8 letters)
  9. 14. - Intelligent marine mammal (7 letters)
  10. 17. - Larval stage of a butterfly (11 letters)
  11. 18. - Red, juicy fruit (10 letters)