Endangered animals

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Across
  1. 3. be troubled
  2. 5. kept safe
  3. 7. usual; typical
  4. 9. length of wings
  5. 10. to die underwater
  6. 11. buyer; customer
  7. 13. types; kinds
Down
  1. 1. recovery; return
  2. 2. in danger
  3. 4. to become
  4. 6. hard; difficult
  5. 8. strong
  6. 12. gone forever