Singleton offspring from these animals are called.......

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Across
  1. 5. hog
  2. 6. eagle
  3. 8. dog
  4. 9. bird
  5. 11. hippopotamus
  6. 14. bee
  7. 15. dove
  8. 16. frog
  9. 19. horse
  10. 21. human
Down
  1. 1. cat
  2. 2. cicada
  3. 3. opposum
  4. 4. rabbit
  5. 7. jellyfish
  6. 10. giraffe
  7. 11. bear
  8. 12. alpaca
  9. 13. butterfly
  10. 17. armadillo
  11. 18. hawk
  12. 19. fish
  13. 20. sheep