Why do Owls Hoot?

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Across
  1. 2. Supernatural or mysterious
  2. 4. Belonging or active in the night
  3. 6. Soul of a dead person
  4. 7. Light in color or having no color
Down
  1. 1. Appearing or active in twilight
  2. 3. A place with perches for fowls or other birds
  3. 5. Harsh or grating in sound