Kittens, Penguins, and Sherlock Holmes

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Across
  1. 4. Instrument Holmes likes to play
  2. 5. Holmes's friend and biographer
  3. 7. Tiny crustaceans eaten by many penguins
  4. 10. Sherlock Holmes's archrival
  5. 11. Classic smoking accessory often shown with Holmes
  6. 14. Flightless bird in a black-and-white suit
  7. 16. Hat often linked to Sherlock Holmes
  8. 19. Rumbly sound of a contented kitten
  9. 20. Plant that sends many cats into playful mode
Down
  1. 1. How penguins usually walk on land
  2. 2. Patchy orange black and white cat coat
  3. 3. Continent associated with many penguins
  4. 6. Another word for a detective
  5. 8. Facial hairs that help a kitten sense the world
  6. 9. City where Holmes solves many cases
  7. 12. Famous London road of Holmes's address
  8. 13. What penguins seem to wear at formal events
  9. 15. Limb a penguin uses to swim
  10. 17. Striped coat pattern common on house cats
  11. 18. Mark left by a tiny cat foot