Gus has conducted research on African carnivores for 40 years. He retired from SANParks as a Research Fellow in 2006. Since then he has been conducting a study on cheetah behavioural ecology in the Kgalagadi Transfrontier Park, South Africa/Botswana. The aim of the study is to define the ecological role and adaptations of the species to an arid environment, incorporating studies of feeding ecology and energetics, ranging behaviour and habitat use, mating system and reproductive success, demographics and threat analyses. The study will lead to a better understanding of the viability of the cheetah in arid regions, its evolutionary adaptations to this environment, its ecological role as a predator, and the threats it faces. It also investigates a number of interesting theoretical concepts in carnivore biology such as optimal foraging, species competition, predator-prey dynamics and mating systems.