Crossword! (Mythical Creatures)

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Across
  1. 3. It flys!
  2. 4. It WAS a human...
  3. 6. It swims a lot
  4. 7. It has a horn on it's head!
Down
  1. 1. They mostly have green skin
  2. 2. A bird that likes fire
  3. 5. Mostly breaths fire