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We do have a rat problem. There are quite a few predator free areas in NZ which are islands or fenced inland areas. With fenced off areas, more problematic than rats are mice, which can get though truely tiny holes in fences, jump quite high and are hard to control. At least rats can be fenced out more easily. In terms of killing pests, some great equipment has been developed recently. A homegrown CO2 powered ", self resetting trap has impressive functionality and ongoing testing is really promising.

www.radionz.co.nz/news/national/313828/self-resetting-rat-traps-20-times-better-than-standard-traps-study