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4. Tapper, S. A Question of Balance: Game Animals and their Role in the British Countryside (Game Conservancy Trust, Fordingbridge, Hampshire, 1999).
5. Harris, S., Morris, P., Wray, S. & Yalden, D. A Review of British Mammals: Population Estimates and Conservation Status of British Mammals other than Cetaceans (Joint Nat. Conserv. Commit., Peterborough, 1995).