Nature

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Across
  1. 5. A giant wave caused by underwater earthquakes
  2. 8. What boars, elephants, and walruses have in common
  3. 10. The deeper you go, the bigger they can get
  4. 11. If they're afraid, they stink
  5. 13. They come out at night
  6. 15. The dinosaurs, the mammoth, and the dodo bird
  7. 16. Term used to describe animals that blend in with their surroundings for defense or hunting
  8. 18. The force responsible for keeping us on the floor
  9. 20. The only bird that can fly backwards
Down
  1. 1. If they're afraid, they ink
  2. 2. A group of ferrets
  3. 3. There are 7 of these. North America and South America are 2 of them.
  4. 4. The ocean that borders California
  5. 5. You can't see it, but you can hear it
  6. 6. The skeletal remains of an animal that died long ago
  7. 7. The number of Great Lakes in the USA
  8. 9. One of the few natural predators of the moose
  9. 10. This animal is not a sinner but their name implies it
  10. 12. The number of seasons
  11. 14. Animal with a pouch that can kick incredibly hard
  12. 17. A group of meerkats
  13. 19. You can see it in the sky during storms