Animal Classification

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Across
  1. 3. to take in air
  2. 4. animals that keep the same body temperature all the time
  3. 6. animals with backbones/spines
  4. 10. animals whose body temperature changes due to their environment
  5. 12. to put things in groups based on traits
  6. 14. animals without a backbone/spine
  7. 15. what mammals use to breathe
  8. 16. animals that swim in the sea
  9. 17. the exterior of a person is made of
  10. 18. how birds have babies
Down
  1. 1. one example is a monkey
  2. 2. the exterior of a bird is made of
  3. 5. one example is a frog
  4. 7. also called a spine, only vertebrates have this
  5. 8. the exterior of a reptile is made of
  6. 9. one example is a crocodile
  7. 11. one example is an eagle
  8. 13. the hair of an animal