Normal difficulty

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Across
  1. 3. to give a warning
  2. 4. not legal
  3. 6. very big
  4. 7. this animal is in danger of becoming extinct
  5. 10. a person who knows everything about a subject
  6. 11. to find something new
Down
  1. 1. a person who buys things
  2. 2. animals that live in the wild
  3. 3. something related to the internet
  4. 5. a product, animal or person that is difficult to find or see
  5. 8. writing a letter but you don't give your name
  6. 9. an animal that has very low numbers in the wild