The population of most species is assessed periodically by species-specific surveys of breeding numbers. The frequency of surveys varies between species. The latest available results from these, together with the years of survey, are provided in the following table.
Year of survey Species Population estimate (breeding or territorial pairs) 2000 Honey Buzzard1 33-69 2005 Marsh Harrier2 363-429 2004 Hen Harrier3 749 2006 Montagu’s Harrier4 13-17 1994-2000 Goshawk5 410 2003 Golden Eagle6 442 2006 Osprey7 147-161 1990-94 Merlin8 1,330 2002 Peregrine9 1,492 2000 Hobby10 2,200 2000 Sparrowhawk11 41,000 2001 Buzzard12 44-61,000 2000 Kestrel13 35,400 2006 Red Kite14 1,200 2006 White-tailed Eagle15 36 1 Batten, L.A. 2001. European Honey-buzzard Survey 2000 and 2001: preliminary results and request for further surveys. “British Birds” 94: 143-144. Ogilvie, M.A. 2003. European Honey-buzzards in the UK- correction to breeding totals. “British Birds” 96: 145. 2 Holling, M. and the Rare Breeding Birds Panel 2008. Rare breeding birds in the United Kingdom in 2005. “British Birds” 101: 276-316. 3 Sim, I.M.W., Dillion, I.A., Eaton, M.A., Etheridge, B., Lindley, P., Riley, H., Saunders, R., Sharpe, C. and Tickner, M. 2007. Status of the Hen Harrier Circus cyaneus in the UK and Isle of Man in 2004, and a comparison with the 1988-89 and 1998 surveys. Bird Study 54(2): 256-267. 4 Holling, M. and the Rare Breeding Birds Panel 2009. Rare breeding birds in the United Kingdom in 2006. “British Birds” 102: 158-202. 5 Petty, S.J. 1996. History of the Northern Goshawk Accipiter gentilis in Britain. In: Holmes, J.S. and Simons J.R. (eds), “The introduction and naturalisation of birds”. HMSO, London. Scott, D. 2001. Goshawk breeding in Northern Ireland. Northern Ireland Bird Report 1999:114-119. 6 Eaton, M.A., Dillon, I.A., Stirling-Aird, P.K. and Whitfield, D.P. 2007. The status of the Golden Eagle Aquila chrysaetos in Britain in 2003. “Bird Study” 54: 212-220. 7 Holling, M. and the Rare Breeding Birds Panel 2009. Rare breeding birds in the United Kingdom in 2006. “British Birds” 102: 158-202. 8 Rebecca, G. and Bainbridge, I.P. 1998. The breeding status of Merlin Falco columbarius in Britain in 1993-94. “Bird Study” 45:172-187. RSPB/Irish Raptor Study Group data (from UK Raptor Working Group 2000). 9 Banks, A.N., Crick, H.Q.P., Coombes, R, Benn, S., Ratcliffe, D.A. and Humphreys, E. In press. The breeding status of the Peregrine Falcon Falco peregrinus in the United Kingdom and Isle of Man in 2002. “Bird Study”. 10 Clements, R. 2001. The Hobby in Britain: a new population estimate. “British Birds” 94: 402-408. 11 Stone, B.H., Sears, J., Cranswick, PA, Gregory, R.D., Gibbons, D.W., Rehfisch, M.M., Aebischer, N.J. and Reid, J.B. 1997. Population estimates of birds in Britain and in the United Kingdom. “British Birds” 90: 1-22. Crick, H.Q.P., Marchant, J.H., Noble, D.G., Baillie, S.R., Balmer, D.E., Beaven, L.P., Coombes, R.H., Downie, I.S., Freeman, S.N., Joys, A.C., Leech, D.I., Raven, M.J., Robinson, R.A. and Thewlis, R.M. 2004. “Breeding Birds in the Wider Countryside: their conservation status 2003”. BTO Research Report No. 353. BTO, Thetford. 12 Stone, B.H., Sears, J., Cranswick, P.A., Gregory, R.D., Gibbons, D.W., Rehfisch, M.M., Aebischer, N.J. and Reid, J.B. 1997. Population estimates of birds in Britain and in the United Kingdom. “British Birds” 90: 1-22. Crick, H.Q.P., Marchant, J.H., Noble, D.G., Baillie, S.R., Balmer, D.E., Beaven, L.P., Coombes, R.H., Downie, I.S., Freeman, S.N., Joys, A.C., Leech, D.I., Raven, M.J., Robinson, R.A. and Thewlis, R.M. 2004. “Breeding Birds in the Wider Countryside: their conservation status 2003”. BTO Research Report No. 353. BTO, Thetford. 13 Stone, B.H., Sears, J., Cranswick, PA, Gregory, R.D., Gibbons, D.W., Rehfisch, M.M., Aebischer, N.J. and Reid, J.B. 1997. Population estimates of birds in Britain and in the United Kingdom. British Birds 90: 1-22. Crick, H.Q.P., Marchant, J.H., Noble, D.G., Baillie, S.R., Balmer, D.E., Beaven, L.P., Coombes, R.H., Downie, I.S., Freeman, S.N., Joys, A.C., Leech, D.I., Raven, M.J., Robinson, R.A. and Thewlis, R.M. 2004. “Breeding Birds in the Wider Countryside: their conservation status 2003”. BTO Research Report No. 353. BTO, Thetford. 14 Holling, M. and the Rare Breeding Birds Panel 2009. Rare breeding birds in the United Kingdom in 2006. “British Birds” 102: 158-202. 15 Holling, M. and the Rare Breeding Birds Panel 2009. Rare breeding birds in the United Kingdom in 2006. “British Birds” 102: 158-202.