[1] Zool Soc London, Inst Zool, London NW1 4RY, England
[2] Gateway Natl Recreat Area, Staten Isl, NY 10305 USA
[3] Univ Redlands, Dept Biol, Redlands, CA 92373 USA
[4] Birdlife Int, Cambridge CB3 0NA, England
[5] Rural Planning Serv Ltd, St Ives PE27 5JL, Cambs, England
[6] New York Zool Soc, Wildlife Conservat Soc, Bronx, NY 10460 USA
[7] CSIRO, Davies Lab, Rangelands & Savannas Program, Aitkenvale, Qld 4814, Australia
[8] Univ Pretoria, Mammal Res Inst, Dept Zool & Entomol, ZA-0002 Pretoria, South Africa