Yes cats are a huge concern to conservationists but this is why we have traps for wild cats and other pests but unfortunatly plenty of domestic cats are causing problems which is why i think they should be banned in areas that have a population of rare native wildlife. They are simply not letting in any forign animals even if they are vegeterian and would most likely die in new zealands cold, wet environment without proper lighting and care. Kinda ridiculous, especially if they are allready here.