Animals and nature

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Across
  1. 3. I look ugly, but one day, I will be beautiful
  2. 4. most important animal in the world
  3. 5. you cannot see me
  4. 7. I am so high
  5. 8. hard like a...
  6. 9. big and beautiful animal
Down
  1. 1. trees have a lot of them
  2. 2. gift for Mother's Day
  3. 3. fastest animal in the world
  4. 6. human's best friend