Hedgehogs prey on the endangered, endemic giant snails (Powelliphanta), the endemic weta species, and various other native invertebrates. The critically endangered Cromwell chafer beetle (Prodontria lewisi) is threatened due to predation by hedgehogs as well as other introduced species.
As well as preying on invertebrates hedgehogs may have contributed to the decline and extinction of up to fifteen bird species!!!!
The New Zealand hedgehogs, as with their European counterparts, carry various parasites and diseases. They are a potential carrier of foot-and-mouth disease if it were to reach New Zealand.
Contrary to popular belief, hedgehogs dont carry fleas and ringworms are not common but some hedgehogs do suffer from mange. This is caused by a small mite, which is not harmful to humans but can cause enormous suffering to the hedgehog.