1. R. B. Sage (rsage@gwct.org.uk), A. N. Hoodless, M. I. A. Woodburn, R. A. H. Draycott, N. W. Sotherton, Game & Wildlife Conservation Trust, Fordingbridge, SP6 1EF, UK.
2. J. R. Madden, Center for Research in Animal Behaviour, Exeter Univ.,, Exeter, UK.