reptiles and birds crossowrd puzzle

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Across
  1. 4. Some reptiles have this type of heart
  2. 6. When a bird takes off
  3. 7. Their diet shapes their ____
  4. 8. Birds are ____
Down
  1. 1. provides nourishment to the embryo and contains membranes to protect it
  2. 2. Reptiles have this type of skin
  3. 3. This is located on a bird and they fall off as well
  4. 5. Reptiles are ____