The cattle can be rounded up and sold to bring in income that can be invested in other parts of the business. (The Olkola people are focusing on a few industries, including tourism and carbon farming.)
The brumbies, as pretty as they are, have to be killed. So do the wild pigs who do an enormous amount of damage. At one waterhole we went to the pigs had eaten all the water lilies and damaged the area around the waterhole with their hooves.
The feral cats are even more difficult to get rid of. They’re a real danger to awal (the endangered golden shouldered parrot), which is one of the Olkola’s totems.