References

Crawford, A. K. (2003) The Fourth Otter Survey of England 2000–2002. Environment Agency, Bristol.

Crawford, A. K. (2011) The Fifth Otter Survey of England 2009–2010. Environment Agency, Bristol.

Delany, M. J. (ed.) (1985) Yorkshire Mammals. University of Bradford, Bradford.

Howes, C. A. (1983) An atlas of Yorkshire mammals. Naturalist, 108: 41–82.

Lenton, E. J., Chanin, P. R. F. and Jefferies, D. J. (1980) Otter Survey of England 1977-79. Nature Conservancy Council, London.

Oxford, G., Mortimer, J., Hanson, A, Pickles, S. and Thompson, M. (2007) Preliminary mapping of terrestrial mammal distributions in North Yorkshire 1996-2006. Naturalist, 132: 73-99.

Strachan, R., Birks, J. D. S., Chanin, P. R. F. and Jefferies, D. J. (1990) Otter Survey of England 1984–1986. Nature Conservancy Council, Peterborough.

Strachan, R. and Jefferies, D. J. (1996) Otter Survey of England 1991–1994: A Report on the Decline and Recovery of the Otter in England and on its Distribution, Status and Conservation in 1991–1994. The Vincent Wildlife Trust, London.

Strachan, C, Strachan, R. and Jefferies, D. J. (2000) Preliminary Report on the Changes in the Water Vole Population of Britain as shown by the National Surveys of 1989–1990 and 1996–1998. The Vincent Wildlife Trust, London.

Ward, A. I. (2005) Expanding ranges of wild and feral deer in Great Britain. Mammal Rev., 35: 165–173.

Woodroffe, G. L. (1994) The water vole – some aspects of its ecology. British Wildlife, 5: 296-303.


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