Affiliation: | *Nakuru Wildlife Trust, P.O. Box 33, Nakuru, Kenya;†Bodega Bay Institute of Pollution Ecology, 142 Vicente Road, Berkeley, California 94705, U.S.A.;‡Clinical Research Centre, Watford Road, Harrow, Middlesex, HA 1 3 UJ, England;§Monks Wood Experimental Station, The Institute of Terrestial Ecology, Abbots Ripton, Huntingdon, PEI7 2LS, England |