Mus musculus

A two-phase translocation of Hamilton's frog (Leiopelma hamiltoni) into Zealandia Ecosanctuary Te Māra a Tāne, in Wellington, was the first attempt to restore the species to the mainland. All non-native mammals had been eradicated there, but house mice (Mus musculus) re-invaded, providing an opportunity to investigate their impact on L. hamiltoni. In Phase I, 60 frogs were translocated into mouse-proof enclosures over 2006–2007.

The advent of mammal-resistant fences has allowed multi-species eradications of mammals from ecosanctuaries on the New Zealand mainland. However, maintaining eradication of house mice (Mus musculus) has proven difficult, and at some fenced reserves they are the only exotic mammal present and reach a high population density. Over 5 years we examined the impacts of mice alone on biodiversity at Sanctuary Mountain Maungatautari by comparing forest blocks with relatively high and low numbers of mice.