they are

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Across
  1. 3. A person who studies animals
  2. 5. Pi loves learning about this subject (8 letters)
  3. 6. Main character’s nickname (2 letters)
  4. 8. The city Pi lives in
  5. 10. Pi’s nickname comes from this number
  6. 12. The teacher who inspires Pi’s nickname (5 letters)
  7. 14. Pi’s full first name (3 letters)
  8. 15. The animal that scares Pi in a lesson
  9. 16. A leader of Islam
  10. 17. Pi’s last name (6 letters)
  11. 18. Pi practices multiple ______
Down
  1. 1. The animal park his family owns (3 letters)
  2. 2. A place animals are kept
  3. 3. Pi’s father’s job (10 letters)
  4. 4. The country where Pi grows up (5 letters)
  5. 7. Religion Pi practices first (7 letters)
  6. 9. Pi’s brother’s name
  7. 11. A priest represents this religion
  8. 13. The author of the book
  9. 15. A place Pi visits to pray (5 letters)