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  1. By: Hoyo, J Del - Collar, Nigel J
    Type: Article
    In: Forktail
    Volume: 27
    Date: 2011
    Page Range: 112--113
    Publication Info: Oxford,
  2. By: Collar, Nigel J - Pittman, A J
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 116
    Date: 1996
    Page Range: 256--265
    Publication Info: London, British Ornithologists' Club, 1893-
  3. By: Collar, Nigel J - Rudyanto
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 123A
    Date: 2003
    Page Range: 95--113
    Publication Info: London, British Ornithologists' Club, 1893-
  4. By: Collar, Nigel J
    Type: Article
    In: Forktail
    Volume: 14
    Date: 1998
    Page Range: 82--84
    Publication Info: Oxford,
  5. By: Long, A. J. - Collar, Nigel J
    Type: Article
    In: Forktail
    Volume: 18
    Date: 2002
    Page Range: 111--119
    Publication Info: Oxford,
  6. By: Adams, M. P. - Cooper, Joanne H. - Collar, Nigel J
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 123A
    Date: 2003
    Page Range: 338--354
    Publication Info: London, British Ornithologists' Club, 1893-
  7. By: Wright, Hugh L. - Collar, Nigel J - Lake, I R - Vorsak, Bou - Dolman, Paul M.
    Type: Article
    In: Forktail
    Volume: 28
    Date: 2012
    Page Range: 93--100
    Publication Info: Oxford,
  8. By: Bladon, Andrew J. - Jones, Sam E I - Collar, Nigel J - Dellelegn, Yilma - Donald, Paul F - Gedeon, Kai - Green, Rhys - Spottiswoode, Claire N - Töpfer, Till - Wondafrash, Mengistu
    Type: Article
    In: Bulletin of the African Bird Club
    Volume: 23
    Issue: 1
    Date: 2016-03
    Page Range: 27--45
    Publication Info: Cambridge, African Bird Club, 1994-
  9. By: Lambert, F R - Collar, Nigel J
    Type: Article
    In: Forktail
    Volume: 18
    Date: 2002
    Page Range: 127--146
    Publication Info: Oxford,
  10. By: Rasmussen, Pamela C - Collar, Nigel J
    Type: Article
    In: Forktail
    Volume: 14
    Date: 1998
    Page Range: 41--49
    Publication Info: Oxford,
  11. By: Collar, Nigel J - Tattersall, Ian
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 107
    Date: 1987
    Page Range: 55--59
    Publication Info: London, British Ornithologists' Club, 1893-
  12. By: Collar, Nigel J
    Type: Article
    In: Forktail
    Volume: 30
    Date: 2014
    Page Range: 135--138
    Publication Info: Oxford,
  13. By: Collar, Nigel J
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 136
    Issue: 2
    Date: 2016
    Page Range: 149--150
    Publication Info: London, British Ornithologists' Club, 1893-
  14. By: Collar, Nigel J
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 118
    Date: 1998
    Page Range: 124--126
    Publication Info: London, British Ornithologists' Club, 1893-
  15. By: Collar, Nigel J
    Type: Article
    In: The journal of the Bombay Natural History Society
    Volume: 105
    Date: 2008
    Page Range: 222--223
    Publication Info: Bombay Bombay Natural History Society 1886-
  16. By: Collar, Nigel J - Balen, Bas van,
    Type: Article
    In: Forktail
    Volume: 29
    Date: 2013
    Page Range: 15--18
    Publication Info: Oxford,
  17. By: Bladon, Andrew J. - Töpfer, Till - Collar, Nigel J - Gedeon, Kai - Donald, Paul F - Dellelegn, Yilma - Wondafrash, Mengistu - Denge, Jarso - Dadacha, Galgalo - Adula, Motuma - Green, Rhys
    Type: Article
    In: Bulletin of the African Bird Club
    Volume: 22
    Issue: 2
    Date: 2015-09
    Page Range: 148--161
    Publication Info: Cambridge, African Bird Club, 1994-
  18. By: Donald, Paul F - Collar, Nigel J
    Type: Article
    In: Bulletin of the African Bird Club
    Volume: 18
    Issue: 2
    Date: 2011-09
    Page Range: 168--173
    Publication Info: Cambridge, African Bird Club, 1994-
  19. By: Collar, Nigel J - Hoyo, J Del - Jutglar, F
    Type: Article
    In: Forktail
    Volume: 31
    Date: 2015
    Page Range: 13--23
    Publication Info: Oxford,
  20. By: Collar, Nigel J
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 123
    Date: 2003
    Page Range: 153--153
    Publication Info: London, British Ornithologists' Club, 1893-
  21. By: Rasmussen, Pamela C - Collar, Nigel J
    Type: Article
    In: Bulletin of the Natural History Museum. Zoology series
    Volume: 65
    Issue: 1
    Date: 1999-06-24
    Page Range: 31--50
    Publication Info: Andover, Intercept,
  22. By: Collar, Nigel J - Round, P D - Wells, David R.
    Type: Article
    In: Forktail
    Volume: 1
    Date: 1986
    Page Range: 29--51
    Publication Info: Oxford,
  23. By: Rasmussen, P C - Collar, Nigel J
    Type: Article
    In: Forktail
    Volume: 29
    Date: 2013
    Page Range: 78--87
    Publication Info: Oxford,
  24. By: Collar, Nigel J
    Type: Article
    In: Bulletin of the African Bird Club
    Volume: 1
    Issue: 1
    Date: 1994-03
    Page Range: 19--20
    Publication Info: Cambridge, African Bird Club, 1994-
  25. By: Collar, Nigel J
    Type: Article
    In: Forktail
    Volume: 20
    Date: 2004
    Page Range: 71--87
    Publication Info: Oxford,
  26. By: Collar, Nigel J
    Type: Article
    In: Forktail
    Volume: 27
    Date: 2011
    Page Range: 29--38
    Publication Info: Oxford,
  27. By: Collar, Nigel J - Eaton, James A. (Conservationist) - Hutchinson, R O
    Type: Article
    In: Forktail
    Volume: 29
    Date: 2013
    Page Range: 19--24
    Publication Info: Oxford,
  28. By: Collar, Nigel J - Marsden, S J
    Type: Article
    In: Forktail
    Volume: 30
    Date: 2014
    Page Range: 23--27
    Publication Info: Oxford,
  29. By: Fishpool, Lincoln D. C. - Collar, Nigel J
    Type: Article
    In: Bulletin of the African Bird Club
    Volume: 13
    Issue: 2
    Date: 2006-08
    Page Range: 130--135
    Publication Info: Cambridge, African Bird Club, 1994-
  30. By: Hille, Sabine M - Collar, Nigel J
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 129
    Date: 2009
    Page Range: 217--221
    Publication Info: London, British Ornithologists' Club, 1893-
  31. By: Collar, Nigel J
    Type: Article
    In: Forktail
    Volume: 27
    Date: 2011
    Page Range: 100--102
    Publication Info: Oxford,
  32. By: Collar, Nigel J
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 127
    Date: 2007
    Page Range: 97--107
    Publication Info: London, British Ornithologists' Club, 1893-
  33. By: Eaton, James A. (Conservationist) - Collar, Nigel J
    Type: Article
    In: Forktail
    Volume: 31
    Date: 2015
    Page Range: 107--110
    Publication Info: Oxford,
  34. By: Eaton, James A. (Conservationist) - Shepherd, C R - Rheindt, F E - Harris, J B C - Balen, Bas van, - Wilcove, David Samuel - Collar, Nigel J
    Type: Article
    In: Forktail
    Volume: 31
    Date: 2015
    Page Range: 1--12
    Publication Info: Oxford,
  35. By: Collar, Nigel J - Abebe, Yilma Dellelegn - Fishpool, Lincoln D. C. - Gabremichael, Merid Nega - Spottiswoode, Claire N - Wondafrash, Mengistu
    Type: Article
    In: Bulletin of the African Bird Club
    Volume: 15
    Issue: 2
    Date: 2008-09
    Page Range: 180--190
    Publication Info: Cambridge, African Bird Club, 1994-
  36. By: Mallari, Neil Aldrin D - Crosby, M J - Collar, Nigel J
    Type: Article
    In: Forktail
    Volume: 20
    Date: 2004
    Page Range: 124--128
    Publication Info: Oxford,
  37. By: Rassmussen, P C - Allen, D. N. S. - Collar, Nigel J - Demeulemeester, B - Hutchinson, R O - Jakosalem, P G C - Kennedy, Robert S - Lambert, F R - Paguntalan, L M
    Type: Article
    In: Forktail
    Volume: 28
    Date: 2012
    Page Range: 1--20
    Publication Info: Oxford,
  38. By: Collar, Nigel J
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 118
    Date: 1998
    Page Range: 57--58
    Publication Info: London, British Ornithologists' Club, 1893-
  39. By: Collar, Nigel J - Fishpool, Lincoln D. C.
    Type: Article
    In: Bulletin of the African Bird Club
    Volume: 13
    Issue: 1
    Date: 2006-03
    Page Range: 18--27
    Publication Info: Cambridge, African Bird Club, 1994-
  40. By: Collar, Nigel J - Fisher, Clemency T. - Feare, Christopher J.
    Type: Conference
    In: Bulletin of the British Ornithologists' Club
    Volume: v.123A (2003) [Conference]
    Date: 2003
    Page Range: 1-360
    Publication Info: London, British Ornithologists' Club, 1893-