Supercroc vs Titanoboa

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Across
  1. 1. This means doing something at the same time
  2. 4. Something that is super old
  3. 6. Means not to exist anymore
  4. 10. This is a cold blooded animal with thick strong skin
  5. 12. This means to hide ready for attack
  6. 13. Means something very official like office wear
Down
  1. 2. This means to be sunk in water or anything else
  2. 3. This means to face a problem directly
  3. 5. plants or animals that live partly in water and partly on land
  4. 7. This is hidden like nature
  5. 8. This word mean something gargantuan
  6. 9. This is the poisonous liquid produced by snake or other living things
  7. 11. This is to suddenly attack