Under the sea

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Across
  1. 2. I have a hard shell
  2. 4. I can make myself bigger by puffing up
  3. 8. If I lived on land you could ride me
  4. 9. I am a mammal and I like to jump and do tricks
  5. 10. I have a very sharp nose
  6. 12. I am the largest animal on planet Earth
Down
  1. 1. I look like I belong in the night sky
  2. 3. I live on the bottom of the sea and have big claws
  3. 4. I am a bird but I can't fly
  4. 5. I look like a snake
  5. 6. I have lots of sharp teeth
  6. 7. I am very slimy
  7. 11. I have eight arms