4

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Across
  1. 3. Winter fur
  2. 5. Wily howler
  3. 7. Slippery fish
  4. 8. Burrower
  5. 12. Thin wool
  6. 13. Fast bird
  7. 14. Tree bird
  8. 15. Hairy brawler
  9. 17. Soaring bird
  10. 19. Graceful runner
  11. 20. Red chest
  12. 22. Game bird
  13. 23. Round bird
  14. 24. Tiny fish
  15. 25. Sea flier
Down
  1. 1. Fast hopper
  2. 2. Fierce beast
  3. 4. Big beak
  4. 6. Tiny singer
  5. 9. Sea spines
  6. 10. Farm brayer
  7. 11. Cheek stuffer
  8. 16. Flat swimmer
  9. 18. Noisy bird
  10. 21. Ice bird