Animal Groups

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Across
  1. 4. one of the flat pieces of hard material that covers the skin of a fish
  2. 5. this animal group has gills
  3. 7. to take air into and out of the lungs
  4. 8. the outer layer of a person or animals body
  5. 9. how big or small something is
  6. 12. to move smoothly over a surface
Down
  1. 1. the animal group that gives birth to live young, has fur or hair
  2. 2. one of the soft, light things that grow from a birds skin
  3. 3. a home built by birds for their eggs
  4. 5. to move through air
  5. 6. this animal group is cold blooded, they have scales
  6. 10. a part of the body that a bird uses to fly
  7. 11. to make it easier for someone to do something