Sea creatures

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Across
  1. 3. Snakelike fish with a fearsome grin
  2. 5. Even more limbs than its octo cousin
  3. 7. Spiny tide pool dweller
  4. 8. The world is your
  5. 9. Happy as a
  6. 10. 3 hearts, more limbs, camouflage expert
  7. 14. The jumbo version of this guy creates quite the paradox
  8. 16. Sushi staple
  9. 18. Unicorn of the sea
  10. 19. Sea cow
  11. 20. T-shaped terror nailing it in the deep
  12. 21. Upright swimmer with an adorable snoot
Down
  1. 1. Tooth filled tropical hunter
  2. 2. Drifting ocean stinger
  3. 4. Long antennaed crustaceans
  4. 6. Great jumper that communicates with clicks and whistles
  5. 7. Beach barker
  6. 11. Shore scavenging scuttling shellfish
  7. 12. Duelist of the deep
  8. 13. Largest singers around
  9. 15. Ocean glider with a venomous barb
  10. 16. Shell backed ocean traveler
  11. 17. Apex predator feared by all the surfers