'Combinations er, ir, ur

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Across
  1. 3. These animals have beaks and feathers.
  2. 7. The reptile that carries its home on its back.
  3. 8. The person who assists a doctor.
  4. 9. Most people have 10 of these.
  5. 10. Another word for a digit.
  6. 12. To be in need of hydration.
  7. 13. A collection of cows.
Down
  1. 1. There are 26 of these in our alphabet.
  2. 2. To bother someone or to get on someone's nerves.
  3. 4. This day comes after Friday.
  4. 5. Most people eat this bird on Thanksgiving.
  5. 6. The singular word for people.
  6. 9. The grade you were in last year.
  7. 11. The day you were born.