Animals and nature

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