What animal am I?

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Across
  1. 2. I am a pet and I wag my tail when I am happy.
  2. 4. I live in Australia and have a pouch on my stomach.
  3. 10. I have four legs, a long neck and like to eat leaves.
  4. 11. I live in the sea and am very very big!
  5. 12. I have no legs and am long and slide around on my stomach.
Down
  1. 1. I live on a farm, am pink and have a curly tail.
  2. 2. I live on ponds and people like to feed me bread.
  3. 3. I have a mane of hair around my head and hunt other animals for dinner.
  4. 5. I am a pet that lives in a bowl of water.
  5. 6. I live on a farm and people like to ride me.
  6. 7. I have stripes and am orange and black coloured.
  7. 8. I am a pet and I like to eat fish.
  8. 9. I make most of the milk people drink.