Animals but they're all ghosts

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Across
  1. 2. This ghost now haunts your cheeseburger, moaning for revenge
  2. 5. This ghost has a long neck
  3. 7. This curved yellow ghost grew from a tree. It's as surprised as you are.
  4. 10. This ghost had a leathery shell, but it couldn't protect him from cars
  5. 12. This ghost died once, then died a second time mid-haunting. Weird.
  6. 13. If this ghost had died earlier, it might have been a ghost caterpillar
Down
  1. 1. This ghost is very negative- anything you ask, he'll just say "nay."
  2. 3. This ghost can't fly very well, but often lays ghost eggs
  3. 4. This is the scariest ghost of all because it buzzes and stings
  4. 6. This ghost had a lot of laws protecting him, but still ended up deep fried
  5. 8. This ghost liked to roll in the mud, so now he's a muddy ghost. Gross.
  6. 9. This flappy ghost was already very halloweeny before it died.
  7. 11. This ghost tends to stop in front of cars and just stare