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The following categories exist in the wiki.

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1. Abeillia ‎(1 member)
2. Abroscopus ‎(3 members)
3. Aburria ‎(1 member)
4. Acanthagenys ‎(1 member)
5. Acanthidops ‎(1 member)
6. Acanthis ‎(2 members)
7. Acanthisitta ‎(1 member)
8. Acanthisittidae ‎(2 members)
9. Acanthiza ‎(13 members)
10. Acanthizidae ‎(14 members)
11. Acanthoptila ‎(1 member)
12. Acanthorhynchus ‎(2 members)
13. Acanthornis ‎(1 member)
14. Accipiter ‎(47 members)
15. Accipitridae ‎(73 members)
16. Accipitriformes ‎(4 members)
17. Aceros ‎(5 members)
18. Achaetops ‎(1 member)
19. Acridotheres ‎(10 members)
20. Acritillas ‎(1 member)
21. Acrobatornis ‎(1 member)
22. Acrocephalidae ‎(6 members)
23. Acrocephalus ‎(36 members)
24. Acropternis ‎(1 member)
25. Acryllium ‎(1 member)
26. Actenoides ‎(6 members)
27. Actinodura ‎(7 members)
28. Actitis ‎(2 members)
29. Actophilornis ‎(2 members)
30. Adelomyia ‎(1 member)
31. Aechmophorus ‎(2 members)
32. Aechmorhynchus ‎(1 member)
33. Aegithalidae ‎(4 members)
34. Aegithalos ‎(6 members)
35. Aegithina ‎(4 members)
36. Aegithinidae ‎(1 member)
37. Aegolius ‎(4 members)
38. Aegotheles ‎(9 members)
39. Aegothelidae ‎(2 members)
40. Aegypius ‎(1 member)
41. Aenigmatolimnas ‎(1 member)
42. Aepyornis ‎(1 member)
43. Aepypodius ‎(2 members)
44. Aerodramus ‎(27 members)
45. Aeronautes ‎(3 members)
46. Aethia ‎(4 members)
47. Aethopyga ‎(18 members)
48. Africa ‎(60 members)
49. Afropavo ‎(1 member)
50. Afrotis ‎(2 members)

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