Seeing as nz is only about 500 million years old and taking the geological circumstances into account, the fauna is not very rich in new zealand. Most of the species are invasive (like the kane toad in australia) the food chain is not that elaborate due to limited number of different ecosystems. Yes they have sharks, but on land there are not really any dangers compared to australia. The indegenous people have only one great fear, and that's a giant aggresive eel which lives in the big rivers. It is known to chop off legs and arms. But yeah, nothing dangerous really.