My comment about kaka, relates to the Tararuas. they are prolific in karori and pukaha, because of intensive control / eradication. ie stoats etc.
also, the Tararuas is a good example of impacts of pest. species like kokako, kiwi, robins , whio etc became locally extinct long before 1080 was ever used
kaka and other populations are decimated.
all through predation or habitat destruction