Animal Classification Crossword

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Across
  1. 2. - Food produced by female mammals to nourish their young.
  2. 5. - Protective body coverings found on most fish and reptiles.
  3. 8. - Sorting living things into groups based on shared traits.
  4. 11. - A bird's mouth structure, shaped for the food it eats.
  5. 13. - The vertebrate group that includes eagles and penguins.
  6. 15. - An animal that has a backbone.
  7. 16. - A diagram or chart that shows how animal groups are related.
  8. 18. - Facts or observations that support a scientific claim.
  9. 19. - The vertebrate group that includes trout and sharks.
  10. 20. - Organs dolphins and reptiles use to breathe air.
Down
  1. 1. - Organs fish use to take oxygen from water.
  2. 3. - A vertebrate with hair or fur whose females produce milk.
  3. 4. - A vertebrate with dry, scaly skin, such as a snake or turtle.
  4. 6. - A column of small bones along an animal's back.
  5. 7. - Body parts fish use to steer and move through water.
  6. 9. - A field guide, article, or other place where scientific facts are gathered.
  7. 10. - Body coverings found only on birds.
  8. 12. - A moist-skinned vertebrate, such as a frog or salamander.
  9. 14. - Amphibians have a moist covering called this.
  10. 17. - Birds lay these with hard shells.