Higher difficulty

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Across
  1. 3. someone highly motivated
  2. 4. to bring together
  3. 7. something happening on the internet
  4. 8. writing a letter without giving your name
  5. 9. an animal that might become extinct soon
  6. 12. a very profitable business
  7. 13. something much faster than normal, could be very tiring
Down
  1. 1. animals that live in the wild
  2. 2. could be in danger
  3. 5. makes something worse
  4. 6. a person who illegally hunts or captures animals
  5. 10. something very bad
  6. 11. a huge piece of floating ice