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Further reading

Berthold, P. 2001. Bird Migration: a general survey. Second edition. Oxford University Press, Oxford.

Brooke, M. de L. & Davies, N.B. (1987) Recent changes in host usage by cuckoos Cuculus canorus in Britain. J. Anim. Ecol. 56: 873-883.

Crick, H.Q.P., Dudley, C., Glue, D.E. & D.L. Thomson.  1997.  UK birds are laying eggs earlier.  Nature Vol 388.

Crick, H.Q.P. & Sparks, T.H.  1999.  Climate change related to egg-laying trends.  Nature Vol 399.

Loxton, D. & Sparks, T. 1999. Arrival of spring migrants at Portland, Skokholm, Bardsey and Calf of Man.  Bardsey Observatory Report 42: 1998.

Mason, C.F.  1995.  Long-term trends in the arrival dates of spring migrants.  Bird Study 42: 182-189.

Riddiford, N. & P. Findley. 1981. Seasonal movements of summer migrants. BTO Guide 18. British Trust for Ornithology, Tring.

Sparks, T.  1999.  Phenology and the changing pattern of bird migration in Britain. Int J Biometeorol 42: 134-138.

Wernham, C.V., Toms, M.P., Marchant, J.H., Clark, J.A, Siriwardena, G.M. & Baillie, S.R. (eds) 2002. The Migration Atlas: movements of the birds of Britain and Ireland. T & A.D. Poyser, London.