Recent years have seen large increases in the number and size of successful invasive species eradications from islands. There is also a long history of large scale removals on larger land-masses. These programmes for mammals and terrestrial plants follow the same cost-area relationship although spanning 10 orders of magnitude in scale. Eradication can be readily defined in island situations but can be more complex on larger land-masses where uncertainties defining the extent of a population, multiple population centres on the same land-mass and ongoing risks of immigration are commonplace.

Australia can’t afford to allow in any more insect colonists like red imported fire ants, electric ants, browsing ants, yellow crazy ants, Argentine ants, African big-headed ants, Asian honeybees, large earth bumblebees and German wasps. These invaders are costing both the Australian environment and economy dearly. Hundreds of millions of dollars are being spent on Australia-wide eradications of red fire ants, electric ants and browsing ants because of their potential for devastating harm to wildlife and impacts on people.