Introduction: A Life Dedicated to African Carnivores
Michael ‘Gus’ Mills, the renowned hyena expert known as the ‘cheerful pessimist of the Kalahari’, died on July 13, 2026. He spent more than 40 years studying Africa’s large carnivores, especially hyenas, wild dogs, and cheetahs. His work challenged misconceptions, advanced field biology, and influenced conservation policy across southern Africa.
Early Life and Unlikely Path to Science
Gus Mills described himself as a ‘very bad student’ who failed South Africa’s high-school leaving examination. He was told science was beyond him. After passing on a second attempt, he joked that he had earned an MA: ‘Matric Again.’ Three years of psychology convinced him he did not want to be a psychologist, but zoology held his attention. A visit to Kruger National Park in 1954, when he was eight, pointed him toward field biology. ‘It did something to me,’ he said. He later studied at the University of Cape Town and completed honors in wildlife management at the University of Pretoria.
The Kalahari Calling
In 1972, Mills heard about a project on brown hyenas in the Kalahari. He went there with his wife Margie, living in a caravan. They stayed for 12 years, studying brown and spotted hyenas in a harsh landscape with basic equipment. Hyenas suited him: complicated animals burdened by simple reputations. He argued that spotted hyenas were skilled hunters with intricate social lives. When the BBC called them ‘ferocious scavengers,’ he wrote to them until the wording changed to ‘formidable hunters.’ When people complained about hyenas smelling, he replied that he knew humans who smelled worse.
Research Methods and Major Contributions
Through mentor Hans Kruuk, Mills encountered the methods of Niko Tinbergen, a founder of ethology. He learned to ask precise questions and spend enough time with animals to answer them. New instruments helped, but he valued direct observation, warning young scientists that equipment is useless without knowing the animal. Mills published more than 150 scientific papers, chapters, and reports. His research on African wild dogs continued for 15 years. He also asked visitors to submit photographs of wild dogs and cheetahs for public censuses, allowing individual identification from markings. This helped establish population sizes in Kruger.
Cheetah Study and Key Findings
In 2006, after retiring from SANParks, Mills returned with Margie to the Kalahari for a six-year cheetah study. They identified 176 animals, aided by visitor photos, and spent around 7,000 hours watching them. About 5,000 hours were spent watching cheetahs rest. Their records of 539 kills showed that steenbok, not springbok, made up the largest share. They also found that males in coalitions were not always brothers. The fieldwork involved repetitive tasks: crouching with tweezers to collect hairs for DNA, waiting for data loggers to drop from collars. Their vehicle once suffered eight punctures in a day. Lisette, the first cheetah they collared, was followed for more than six years.
Philosophy and Later Years
Mills questioned the emphasis on animal counts alone, arguing that numbers said little about ecosystem function. He wanted managers to consider larger systems and the ranges predators need, often divided by fences. He also challenged weak ecological assumptions in conservation projects. His wife Margie described him as a ‘cheerful pessimist’ – sociable, amused, but deeply concerned about environmental decline. Even after formal retirement, he supervised graduate students, worked with San trackers, and took on physically demanding journeys. In 2021, in his mid-70s, he became the oldest man to reach the 5,100-meter summit of Margherita Peak in Uganda’s Rwenzori Mountains.
Legacy
The Kalahari remained the ‘home of his heart.’ It offered long distances, few distractions, and animals that revealed themselves slowly. He taught his family the same patience: children were roused at midnight for bushbabies and at 5 a.m. for big cats. They chanted ‘Hyaenas are beautiful!’ as often as possible. Mills was prepared to stay with an animal for as long as the work required, leaving a legacy of careful observation, public participation, and ecosystem-based conservation.