quite a good study, suburban cat killed 2 natives, x how many cats in NZ?
equates to a few natives
then one would assume pet cats in rural setting may account for more natives over a lifetime
equates to a few more natives
add in the feral cats
oops there goes a few more natives
oh, forgot the possums, rats, mustelids, dogs and land developers
poor little buggers don't stand much of a chance
edit: forgot the study that said the average cat only brings home 40 - 50% of its catch