A good crossword puzzle

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Across
  1. 5. completely aquatic amphibian, very popular as pets
  2. 6. Flying mammal
  3. 9. lizard well known to change colors
Down
  1. 1. the _____ delivers babies to their parents
  2. 2. Likes to chase mice
  3. 3. Man's best friend
  4. 4. Has a trunk
  5. 7. Large marsupial
  6. 8. Largest animal