The beauty of birdsong

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Across
  1. 2. Deep insight or great depth of knowledge or thought.
  2. 4. The action or skill of imitating someone or something.
  3. 5. A countless or innumerable number.
  4. 6. Smooth and sweet-sounding.
  5. 7. Capable of producing a deep or ringing sound.
  6. 10. Thin, supple, and graceful.
  7. 12. A small migratory songbird known for its powerful and beautiful song.
  8. 13. Sweet and soothing (often used of sounds).
  9. 14. Harsh and discordant mixture of sounds.
Down
  1. 1. Splendid or magnificent.
  2. 3. An Australian bird known for its outstanding ability to mimic natural and artificial sounds.
  3. 7. Having or showing keen mental discernment and good judgment.
  4. 8. Deep respect for someone or something.
  5. 9. Remarkably or impressively great in size, extent, or degree.
  6. 11. Extremely delicate and light in a way that seems not to be of this world.