Animal Classification

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Across
  1. 3. Lets us walk, run, lift heavy things
  2. 4. Animals that have a backbone
  3. 5. Creature that swims in water - like Nemo
  4. 8. On a bird's wings that help it fly
  5. 10. An animal with wings that can fly
  6. 11. Birds use this to eat
  7. 14. What a bird makes for it's babies with branches and twigs
  8. 16. An animal that does not lay eggs. Example: humans, dogs
  9. 17. Animals that do not have a backbone
  10. 19. That which makes something unique
  11. 20. If we don't breathe this gas, we will die
  12. 21. Lizards and snakes are types of this
Down
  1. 1. Keeping something safe
  2. 2. How we divide things into groups
  3. 6. Where a creature lives. Example: sea, forest, desert etc.
  4. 7. Creatures that can control their body temperature
  5. 9. We must protect the Earth's ......?
  6. 12. What something does
  7. 13. Humans cannot ..... under water
  8. 15. An animal that can live on both land and water
  9. 18. We say "For ...." to explain something