The Australian continent is host to a delicate ecological balance. Millions of years of geographic isolation saw the environment evolve with few native predators and no native hoofed animals.
Human migration has upset that balance, in particular since European settlement. Feral animals impact on native species by predation, competition for food and shelter, destroying habitat and by spreading diseases.
An example is the mass extinctions of many small marsupial species as a result of feral cat predation.
Over 80 per cent of ranger groups are undertaking work to manage feral animal populations.
Feral cats and feral pigs are a key target for around a third of ranger groups. And while foxes and camels are not as widespread, they are also targeted by ranger groups in the areas they occur.