Creatures fast and slow

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Across
  1. 3. Sounds like a racy 1967 hippie musical
  2. 9. South African rugby player
  3. 10. Fastest fish
  4. 11. Is it a dog? Is it a bus?
  5. 12. Fastest bird on land
  6. 13. Indian cat or Leicester footballer?
  7. 14. Runs at Southwell, Cowlick, Ascot etc.
  8. 15. The Lazy Runner's deadly sin?
  9. 18. Rhymes with snippet
Down
  1. 1. Road crossing with Belisha beacons
  2. 2. Has a shell but no legs
  3. 4. Aussie boomer
  4. 5. I'm a gnu. How do you do?
  5. 6. Has a shell and four legs
  6. 7. Fastest bird in the air
  7. 8. This cat sounds as if it would not run a fair race
  8. 16. British rugby player
  9. 17. This bird is fast by name and by nature