Underwater crossword

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Across
  1. 3. Their home is on their back.
  2. 5. The male gives birth to babies.
  3. 7. They are really intelligent mammals.
  4. 9. They can nip you with their claws.
  5. 10. A fish that makes you laugh.
  6. 12. The bad fish on movies.
Down
  1. 1. They have a lot of tentacles.
  2. 2. The cat of the underwater.
  3. 4. A fish that do not have brain and heart.
  4. 6. Their tail can kill you.
  5. 8. It is really big, black & white.
  6. 11. The big unicorn of the sea.