1. Cram, A. and Evans, S.M. 1980. Stability and lability in the evolution of behaviour in Nereid polychaetes. Anim. Behav. 28: 483–490.
2. Davidson, P.E. 1967. The Oystercatcher as a predator of commercial shellfisheries. Ibis 109: 473–474.
3. Dugan, P.J. 1981. Seasonal movements of shorebirds in relation to spacing behaviour and prey availability. Unpublished Ph.D. thesis, University of Durham.
4. Drinnan, R.E. 1957. The winter feeding of the Oystercatcher (Haematopus ostralegus) on the edible cockle (Cardium edule). J. Anim. Ecol. 26: 441–469.
5. Evans, P.R., Herdson, D.M., Knights, P.J. and Pienkowski, M.W. 1979. Short-term effects of reclamation of part of Seal Sands, Teesmouth, on wintering waders and Shelduck. Oecologia 14: 183–206.