Classifying Animals

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Across
  1. 5. Animal that relies on the environment to control body temperature.
  2. 6. Cold-blooded animals with scaly skin that live on land.
  3. 9. Animal that has a backbone or spine.
  4. 11. Reproductive method of birds and many reptiles.
  5. 12. Characteristic feature of mammals.
  6. 13. Process where fish lay and fertilize eggs.
  7. 15. Unique covering found only on birds.
  8. 16. External surroundings that affect cold-blooded animals.
  9. 17. Organs used by fish to breathe underwater.
  10. 19. Animals with feathers that hatch from hard-shelled eggs.
  11. 20. Animals that live in water and breathe using gills.
  12. 22. Protective covering found on fish and reptiles.
Down
  1. 1. Structure found in vertebrates that supports the body.
  2. 2. Hard outer covering found on many invertebrates.
  3. 3. Animal that does not have a backbone.
  4. 4. Process of grouping animals based on characteristics.
  5. 7. Organs used to breathe air on land.
  6. 8. Animals with hair that give birth to live young and produce milk.
  7. 10. Feature of arthropods used for movement.
  8. 14. Animals that begin life in water and later develop lungs.
  9. 18. Animals with jointed legs and an exoskeleton.
  10. 21. Animal that can regulate its own body temperature.