ELIZABETH L. BENNETT,∗ ERIC BLENCOWE,† KATRINA BRANDON,‡ DAVID BROWN,§ ROBERT W. BURN,∗∗ GUY COWLISHAW,†† GLYN DAVIES,†† HOLLY DUBLIN,‡‡ E. FA,§§ E. J. MILNER-GULLAND,∗∗∗ JOHN G. ROBINSON,∗ J. MARCUS ROWCLIFFE,†† FIONA M. UNDERWOOD,∗∗ AND DAVID S. WILKIE∗‡‡‡ ∗International Conservation, Wildlife Conservation Society, Bronx, NY 10460, U.S.A. †Zoos and International Species Conservation, Global Wildlife Division, DEFRA, 1/16 Temple Quay House, 2 The Square, Bristol BS1 6EB, United Kingdom ‡CABS-Conservation International, 1919 M Street, N.W. Washington, D.C. 20036, U.S.A. §Overseas Development Institute (ODI), 111, Westminster Bridge Road, London SE1 7JD, United Kingdom ∗∗Statistical Services Centre, The University of Reading, Harry Pitt Building, P.O. Box 240, Whiteknights Road, Reading RG6 6FN, United Kingdom ††Institute of Zoology, Zoological Society of London, Regent’s Park, London NW1 4RY United Kingdom ‡‡IUCN Species Survival Commission, Private Bag X7, Claremont 7735, Cape Town, South Africa §§Durrell Wildlife Conservation Trust, Les Augres Manor, Trinity, Jersey JE3 5BP, United Kingdom ∗∗∗Imperial College London, Division of Biology, Manor House, Silwood Park Campus, Buckhurst Road, Ascot, Berkshire, SL5 7PY, United Kingdom