The stupidest guide to the animal kingdom

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Across
  1. 2. zebra lion
  2. 4. vampire bird
  3. 5. spit horse
  4. 7. tree rat
  5. 8. giddy up
  6. 10. like dog, but pretentious
  7. 12. chomp fish
  8. 14. underground rat
  9. 16. extra long trumpet
  10. 18. sticky iguana
Down
  1. 1. like cat, but high maintenance
  2. 3. electric spaghetti
  3. 4. 300 pound hugs ...and claws
  4. 6. cheese rat
  5. 9. rat
  6. 10. extra stripey tree rat
  7. 11. extra fluffy pet rat
  8. 12. danger noodle
  9. 13. tuxedo bird
  10. 15. jumbo size orca
  11. 17. what does the ___ say?