The Canadian Consulate in Australia and the High Commission. If you are in Australia then you will note that there is a Canadian Consulate in Sydney and a Canadian High Commission in Canberra. Both would be able to assist you if you are involved in an accident, need documents notarized or register a birth while in Australia.
The High Commission of Canada in New Zealand is in the city of Wellington. If you are in New Zealand and in need on consular assistance then you can ask the staff at the High Commission for assistance with marriage registration, apply for a new passport or assist you after an accident.