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1. mammal

   Animal with hair or fur that feeds its young milk

2. bird

   Animal with feathers and a beak that hatches from an egg

3. reptile

   Animal with dry scales that usually lays eggs on land

4. amphibian

   Animal that starts life in water and later lives on land

5. fish

   Animal that lives in water and breathes with gills

6. insect

   Small animal with six legs and three body parts

7. arachnid

   Animal with eight legs, like a spider

8. vertebrate

   Animal with a backbone

9. invertebrate

   Animal without a backbone

10. gills

    Body parts that let fish breathe in water

11. scales

    Small hard plates that cover fish and reptiles

12. feathers

    Soft covering that keeps birds warm and helps them fly

13. exoskeleton

    Hard outer shell that protects some animals

14. warm-blooded

    Able to keep the same body heat in hot or cold weather

15. cold-blooded

    Body heat changes with the air or water around it

16. antenna

    Feeler on an insect's head used to touch and smell

17. thorax

    Middle body part of an insect where legs attach

18. abdomen

    Back body part of an insect

19. beak

    Hard mouth part of a bird

20. lungs

    Body parts that take in air for breathing