how animals survive

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Across
  1. 5. the animals that spend most of their time on trees
  2. 6. they can be on both on land and water
  3. 8. animals that have already disappeared from earth
  4. 9. they have a backbone
  5. 10. slowing down of activity or settling down to a long sleep in the summer months
  6. 11. the animals whose body temperature changes according to the climate
  7. 13. animals that live on land
  8. 15. animals that feed on dead animals
  9. 18. the mass movement of birds from a colder place to a warmer place
  10. 19. animals that spend most of their time in air
  11. 20. they have scales on their body
Down
  1. 1. animals that feed on plants
  2. 2. animals that are in danger of becoming extinct
  3. 3. the sleep during the winter months
  4. 4. animals that have the same temperature all the time
  5. 7. they do not have a backbone
  6. 12. the animals that feed on other animals
  7. 14. the animals that give birth to young ones
  8. 16. animals that feed both on plants and other animals
  9. 17. the animals that feed on other living organisms