The removal of cats in 2000 caused "catastrophic" damage to the ecology of a sub-Antarctic island, a study says.
Since cats were removed from Macquarie Island, rabbit numbers have soared, and the animals are now devastating plants.
Cats previously kept a check on rabbits but were eradicated because they were also eating seabirds, scientists relate in the Journal of Applied Ecology.
...one element of the cost is the 24m Australian dollars ($17m, £11m) that authorities will spend eradicating rabbits and the rats and mice that eat seabird chicks.