Who cares?

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Across
  1. 2. smart creatures
  2. 3. animal that has no natural predators
  3. 6. an animal that were kept as pets
  4. 7. A very fast bird
  5. 8. most numerous creature in the world
  6. 9. an animal that was push to extinction by natural causes
  7. 11. An animal that is not near to extinction
Down
  1. 1. A animal that is microscopic when born
  2. 4. men's best friend
  3. 5. A large marsupial that is found in Oceania
  4. 8. a small animal found in caves
  5. 10. an very rare animal