1. ARC Centre of Excellence for Environmental Decisions, School of BioSciences; University of Melbourne; 3010 Victoria Australia
2. United States Geological Survey; Patuxent Wildlife Research Center; 12100 Beech Forest Road Laurel MD 20708 U.S.A
3. Wildlife Conservation and Science; Zoos Victoria; Parkville 3052 Victoria Australia
4. Arthur Rylah Institute for Environmental Research; Department of Environment and Primary Industries; Heidelberg 3084 Victoria Australia
5. Flora and Fauna Division; NT Department of Land Resource Management; Palmerston 0831 Northern Territory Australia
6. Taronga Conservation Society Australia; Mosman 2088 NSW Australia
7. Institute for Conservation Biology and Environmental Management, School of Biological Sciences; University of Wollongong; Wollongong 2522 NSW Australia