For the Birds

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Across
  1. 3. Bri'ish oil
  2. 4. "Take a ______"
  3. 6. Bird feeder regular
  4. 10. Royal angler
  5. 13. Comes in black and white
  6. 17. Opportunist
  7. 18. Buffalo symbiote
  8. 22. Extinct relative of the pigeon
  9. 23. Chorister, literally
  10. 25. Come in black or white, traditionally
  11. 28. Proof that God has a sense of humor
  12. 29. Pinch below the belt
  13. 31. Lutheran bird
  14. 33. Raise a ruckus
  15. 36. A choice at bat
  16. 37. Habitat is the kitchen?
  17. 39. Helmeted ostrich
  18. 41. "Or won't it?"
  19. 42. Financial term; African shrike
  20. 43. Inseparables
  21. 45. Small falcon
  22. 48. "Stark _____ mad," punnily
  23. 50. Not a bishop but a
Down
  1. 1. Past tense bird
  2. 2. Administrative fowl
  3. 5. Grandfather & Grandson alike
  4. 6. Parade elegantly
  5. 7. Stretch
  6. 8. Singer?
  7. 9. A craftsperson
  8. 11. Has a tall tail?
  9. 12. There's a big one and a little one
  10. 14. To complain
  11. 15. Neither blonde nor brunette
  12. 16. "You old ____!"
  13. 19. A better birdie
  14. 20. Candlelit woodpecker
  15. 21. Superhero sidekick
  16. 24. A grandson
  17. 26. Brief employment
  18. 27. Bond film
  19. 30. Circus performer's platforms
  20. 32. A cross to bear
  21. 34. Onomatopoeic nocturne
  22. 35. Parade ostentatiously
  23. 36. Hope and Betty paired
  24. 38. Outfielder?
  25. 40. Colloquial waterbird
  26. 44. Africa's heaviest flying bird
  27. 46. Letter of the alphabet
  28. 47. Something a hunter might do?
  29. 49. Not a cardinal but a