How are animals different

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Across
  1. 2. most have scales, have fins, have gills, lay eggs
  2. 4. all birds have this
  3. 6. fur or hair; most have live young; drink milk
  4. 7. the body covering of a fish or reptile
  5. 8. feathers; beak and wings; lay eggs; find food for young
  6. 10. the body covering of mammals
  7. 11. takes care of animals at a zoo
Down
  1. 1. smooth, wet skin or rough, bumpy skin, lay eggs in water, most gown live on land
  2. 3. the mouth of a bird
  3. 5. have 3 body parts, 6 legs, have a hard shell
  4. 9. dry skin an scales; some have a shell; lay eggs
  5. 10. covers a bird's body