Blue

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Across
  1. 1. Nocturnal bird
  2. 4. Vital liquid
  3. 5. European currency
  4. 7. Opposite of cold.
  5. 8. color of the sky
  6. 9. Number between 6 and 8
Down
  1. 2. Move in the sea
  2. 3. the largest animal on the planet
  3. 6. animal with eight tentacles
  4. 8. Two-wheeled vehicle