Stems 11

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Across
  1. 1. chopper, rotorcraft
  2. 3. bird-winged aircraft, flying machine
  3. 4. wintry, cold
  4. 7. aggressive, warlike
  5. 9. bird scientist, avian researcher
  6. 14. brain inflammation, cerebral infection
  7. 18. bird study, avian biology
  8. 20. genetic material, DNA strand
  9. 21. present, flowing
  10. 23. sentence structure, grammar
  11. 24. small-headed, underdeveloped cranially
  12. 25. cranial, head-related
Down
  1. 2. money, cash
  2. 5. micrometer, nanometer
  3. 6. classification, categorization
  4. 8. mounted specimens, stuffed animals
  5. 10. combative, hostile
  6. 11. pre-war, pre-conflict
  7. 12. missing, away
  8. 13. miniature world, small-scale system
  9. 15. diminish, lessen
  10. 16. flying reptile, pterosaur
  11. 17. single-colored, unicolor
  12. 19. dormancy, winter sleep
  13. 22. periodic, repeated